At 10% discount, the selling price of a grinder is Rs 48000. What is the selling price if the discount is 25%?

Let the Marked Price (MP) of the grinder be M.
When a discount of 10% is offered, the selling price is 90% of the marked price:

90% of M=48000
100
90
​
×M=48000⟹M=
9
48000×10
​
=
3
160000
​

Now, we need to find the selling price (SP) when a discount of 25% is offered. The new selling price will be 75% of the marked price:

New SP=75% of M
New SP=
100
75
​
×
3
160000
​

New SP=
4
3
​
×
3
160000
​

New SP=
4
160000
​
=40000
Thus, the selling price at a 25% discount is Rs 40000.