Question

S.P. = Rs.21 and gain = 5%.​

Answer 1

Step-by-step explanation:

S.P = Rs. 21, Gain = 5%

∴ C.P. = (S.P. × 100)/(100 + gain %)

= (21 × 100)/(100 + 5)

= (21 × 100)/105

= Rs. 20