A bicycle is sold for 10500 naira at a loss 20%,. Find the cost price of the bicycle

Let x be the cost price of the bicycle.

Since the bicycle is sold at a 20% loss, the selling price is 80% of the cost price.
Therefore, 80% of x is equal to 10500 naira.

0.80x = 10500
x = 10500 / 0.80
x = 13125

Therefore, the cost price of the bicycle is 13125 naira.