Answer :
Given: Cost of 1 Apple = Rs. 8
To Find: Cost of 4, 7, 12, 20 apples.
Formula: 
(i) Substituting x1 = 1 y1 = 8 and x2 = 4 in the formula,
Gives y2 = 32
∴The cost of 4 apples is Rs. 32
(ii) Substituting x1 = 1 y1 = 8 and x2 = 7 in the formula,
Gives y2 = 56
∴The cost of 7 apples is Rs. 56
(iii) Substituting x1 = 1 y1 = 8 and x2 = 12 in the formula,
Gives y2 = 96
∴The cost of 12 apples is Rs. 96
(iv) Substituting x1 = 1 y1 = 8 and x2 = 20 in the formula,
Gives y2 = 160
∴The cost of 20 apples is Rs. 160
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AP - Mathematics