Question

If the total cost of x apples is b cents, what is a general formula for the cost, in cents,
of y apples?

Answer 1

x apples cost equal to b cents
1 apple cost equal to $\frac{b}{x}$ cents

y apples cost equal to $\frac{by}{x}$ cents

Answer 2

You can solve this question by using unitary method.

Cost of 'x' apples = b
Cost of 1 apple = b/x

Cost of y apples = by/x cents.