Question

If the cost of 10 note books is ₹250, then the cost of 15 note books is .

• A. ₹375
• B. ₹275
• C. ₹250

Answer 1

The correct option is A ₹375

Cost of 10 note books = ₹250

The cost of the books(A) increases with the increase in the number of books(B). Hence, they are directly proportional.

$So,\frac{A_1}{B_1}=\frac{A_2}{B_2}$

$\Rightarrow \frac{₹250}{10}=\frac{A_2}{15}$

Hence, the cost of 15 note books
= ₹($25\times 15$)
= ₹375