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Find the Selling Price: Interactive Percentage-Based Pricing Model

Find the Selling Price: Interactive Percentage-Based Pricing Model
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2020-11-14 14:38
FunctionSequenceInequalitySlider AnimationGraphing
This GeoGebra example demonstrates how to calculate the selling price from cost and profit rate through an interactive interface, applying percentage concepts in a business context. The core mathematical ideas involve percentage operations, linear relationships, and algebraic equation solving. Construction highlights: the model uses commands such as If, Point, Polygon, Sequence, Textfield, Segment, and Vector to build dynamic visuals, with InputBoxes for entering cost and profit rate, and Text objects to display the computed price in real time. Suitable for middle school to high school students learning percentages, algebraic modeling, or commercial mathematics, as well as for teachers demonstrating the formula Selling Price = Cost × (1 + Profit Rate) in an engaging way.

GeoGebra Commands & Parameters

  1. If(a, "d", ((If[p ∧ x(P) < 10, "-"] * abs(d)) * "")) → dtext
  2. If(c', "c", (n * "")) → ntext
  3. Point(yAxis) → A
  4. Point(yAxis) → B
  5. If(x(P) ≤ 10, A + (10, 0), B + (10, 0)) → A0
  6. If(x(P) ≤ 10, P, (x(P), y(B))) → P0
  7. Polygon(P, Q, (0, y(Q)), (0, y(P))) → q1, p_1, q_1, g, h
  8. Polygon({P0, A0, A0 + (0, 1), P0 + (0, 1)}) → q2
  9. Polygon({B, B + (10, 0), B + (10, 1), B + (0, 1)}) → q3
  10. Polygon({B, B + (10, 0), B + (10, 1), B + (0, 1)}) → q4
  11. Sequence(Segment[B + (i, 0), B + (i, 1)], i, 1, 9, 1) → l1
  12. Sequence(Sequence[Segment[B + (j + i, 0), B + (j + i, 1)], j, 0, 9, 1], i, 0.1, 0.9, 0.1) → l2
  13. Sequence(Segment[A + (i, 0), A + (i, 1)], i, 1, 9, 1) → l3
  14. Sequence(Sequence[Segment[A + (j + i, 0), A + (j + i, 1)], j, 0, 9, 1], i, 0.1, 0.9, 0.1) → l4
  15. Textfield(n) → InputBox1
  16. Textfield(m) → InputBox2
  17. If(b, "s", (m * "")) → mtext
  18. Segment(If[b_1 ≟ 0, A, A0] + (0, 1.2), If[b_1 ≟ 0, A, A0] + (0, 1.5)) → i
  19. Segment(If[b_1 ≟ 0, P, P0] + (0, 1.2), If[b_1 ≟ 0, P, P0] + (0, 1.5)) → j
  20. Vector(Midpoint[i], Midpoint[j]) → u
  21. Vector(Midpoint[j], Midpoint[i]) → v
  22. Segment(A0 - (0, 0.2), A0 - (0, 0.5)) → k
  23. Segment(P0 - (0, 0.2), P0 - (0, 0.5)) → l
  24. Vector(Midpoint[k], Midpoint[l]) → w
  25. Vector(Midpoint[l], Midpoint[k]) → e
  26. Segment(B + (0, 1.2), B + (0, 1.5)) → f
  27. Segment(B + (10, 1.2), B + (10, 1.5)) → r
  28. Vector(Midpoint[f], Midpoint[r]) → s
  29. Vector(Midpoint[r], Midpoint[f]) → t
  30. Segment(B - (0, 0.2), B - (0, 0.5)) → f_1
  31. Segment(B + (10, -0.2), B + (10, -0.5)) → g_1
  32. Vector(Midpoint[f_1], Midpoint[g_1]) → u_1
  33. Vector(Midpoint[g_1], Midpoint[f_1]) → v_1
  34. If(a, "d", If[b, If[b_1 ≟ 0, "s", "x"], "c"]) → text12
  35. Sequence(Segment[A + (10 + i, 0), A + (10 + i, 1)], i, 0.1, x(P) - 10, 0.1) → l6
  36. Sequence(Segment[A + (10 + i, 0), A + (10 + i, 1)], i, 0, floor(x(P) - 10)) → l5
  37. Sequence(Segment[A0 + (i, 0), A0 + (i, 1)], i, 0, floor(x(P0) - 10)) → l7
  38. Sequence(Segment[A0 + (i, 0), A0 + (i, 1)], i, 0.1, x(P0) - 10, 0.1) → l8
  39. If(p, m - n, abs(n - m)) → c
  40. Segment(If[x(P) ≤ 10, A + (10, 0), P], If[x(P) ≤ 10, B + (10, 1), x(P)]) → h_1
  41. Segment(A, B + (0, 1)) → i_1
  42. Segment(A - (0, 0.2), A - (0, 0.5)) → j_1
  43. Segment(P - (0, 0.2), P - (0, 0.5)) → k_1
  44. Vector(Midpoint[k_1], Midpoint[j_1]) → w_1
  45. Vector(Midpoint[j_1], Midpoint[k_1]) → c_1
  46. Segment(A0 + (0, 1.2), A0 + (0, 1.5)) → k'
  47. Segment(P0 + (0, 1.2), P0 + (0, 1.5)) → l'
  48. Vector(Midpoint[k'], Midpoint[l']) → e_1
  49. Vector(Midpoint[l'], Midpoint[k']) → l_1
  50. If(p, "Change", If[x(P) < 10, "Loss", If[x(P) > 10, "Profit", ""]]) → change

AI Drawing Prompt Reference

Create a graph showing how cost and profit rate affect the selling price. Start by drawing two vertical lines as the y-axis. Then, draw a point P on the x-axis to represent the cost. Draw another point P0 to represent the position of P when x is greater than 10. Use these points to draw a quadrilateral representing the relationship between cost and selling price. Draw two points A and B on the y-axis to represent the starting points of cost and selling price. Then, draw a series of vertical and horizontal line segments to form a grid, representing changes in cost and selling price. Draw two slanted lines to represent the cost and selling price lines. Finally, use text boxes to input cost and profit rate, calculate, and display the selling price.
The prompt above was compiled from the original drawing commands and is for reference only.