Answer :

Given: Cost of 1 Apple = Rs. 8

To Find: Cost of 4, 7, 12, 20 apples.

Formula:

(i) Substituting x_{1} = 1 y_{1} = 8 and x_{2} = 4 in the formula,

Gives y_{2} = 32

∴The cost of 4 apples is Rs. 32

(ii) Substituting x_{1} = 1 y_{1} = 8 and x_{2} = 7 in the formula,

Gives y_{2} = 56

∴The cost of 7 apples is Rs. 56

(iii) Substituting x_{1} = 1 y_{1} = 8 and x_{2} = 12 in the formula,

Gives y_{2} = 96

∴The cost of 12 apples is Rs. 96

(iv) Substituting x_{1} = 1 y_{1} = 8 and x_{2} = 20 in the formula,

Gives y_{2} = 160

∴The cost of 20 apples is Rs. 160

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