Question

if 11% is lost on books sold at Rs 10.68, what was the cost price of the books? At what price should they be sold at to yield a profit of 10% ?​

Answer 1

sp=10.68

lost%=11

let,cp be,x

thn lost%=cp-sp/cp×100

11=x-10.68/x(100)

11×x/100=x-10.68

11x-x/100 = -10.68

11x-100x / 100 = -10.68

-89x/100 = -10.68

89x/100 = 10.68

x = 10.68×100/89

x = 1068/89

x = 12

cp =12

profit = 10%

sp = x

then profit percentage. = sp -cp /cp ×100

10 = x - 12/12×100

10×12/100 = x - 12

1.2 = x -12

x = 12 +1.2

x = 13.2

sp = 13.2