Question

if apples are bought at 11 for RS 10 and sold at 10 for RS 11, how much will be the gain%

Answer 1

Given CP for 11 apples = Rs10
Cp for 1 apple = Rs 10/11
SP for 10 apples = Rs11
SP for 1 apple = Rs 11/10
Gain = SP - CP 
= [11/10] - [10/11]
= [121 - 100]/110
= 21/110
Gain = Rs 21/110
Gain % = [gain/CP] ×100
=  [21/110] / [10/11]   ×100
=  [21/110]×[11/10]  × 100
=  [231/1100]
=  0.21%
Gain % = 0.21%