Question

A lending library has a fixed charge for the first three days and an additional charge for each day thereafter. Saritha paid Rs. 27 for a book kept for seven days, while Susy paid Rs. 21 for the book she kept for five days. Find the fixed charge and the charge for each extra day.

Answer 1

Let the fixed charge for 3 days be x

Let the charge per extra day be y

Hence, Saritha has 4 extra days and Susy has 2 extra days.

So x + 4 y = 27

And x + 2 y = 21

Solving

y = 3 and

x = 15