Question

A man bought a cardboard sheet for Rupees 3600and spent rs 100 on transport paying rs300for labour he had 330boxes made he sol d at 14each find the profit percent

Answer 1

4. The product of a rational number with its reciprocal is always
(a) 0 (b) infinite (c) 1 (d) None

Answer 2

Amount spent ( Cost price ) = 3600+100+300=4000 
Amount gained (Selling price) =330x14=4620

Profit percentage = (S.P - C.P)/S.P X 100 
                            = 4620- 4000 / 4620 X100
                            = 620/4620X100
                            = 31/231X100
                            =13.14 %

Hope its helpful ..!