By selling 45 lemons, a vendor loses a sum equal to the selling price of 3 lemons. Find his loss per cent.

Let × be the price of a lemons.

Selling Price of 3 lemons = 3x.

Selling Price of 45 lemons = 45x.

Cost Price of 45 lemons = 45 × + 3x

= 48x

Loss = CP - SP

= 48 × – 45x

= 3x

= 6.25%