Wheat is cheaper than rice by 25%. By what percent is rice costlier than wheat?

Given:

Wheat is cheaper than rice by 25%.

To do:

We have to find by what percent the rice is costlier than wheat.

Solution:
Let the cost price of Wheat be Rs. 100.

This implies,

Cost price of Rice $=100+\frac{25}{100}\times100$

$=100+25$

$=Rs.\ 125$

Required percent $=\frac{25}{125}\times100$

$=20 \%$

Therefore, Rice is $20 \%$ costlier than Wheat.