Question

By selling a pen for rs 165,she gained 10percent. if she sold it for rs 157.50.how much would he loss or gain

Answer 1

if 110 is the SP CP=100
165 was the SP 
110 ------100
165-------x 
x/100=165/110
x=(100*165)/110 CP= 150 
sold for 157.50 
150--------------7.50
100--------------x 
x/7.50 = 100/150 
x=7.50*100/150 
She makes a profit of 5% 

Answer 2

Hwy,sup!

Let the cost price of pen be 100x.

gain=10%

So, selling price =100x(1+10/100)=110x.

Also selling price= 165.

So, 110x = 165.
x=165/110.
100x = 165/110 ×100 = 150.

So cost price=150.

If selling price=157.5

Gain= 157.5-150
=7.5

Gain%= gain/CP ×100.

= 7.5/150 ×100.

= 5%.

Hope it helps.