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 10y%?

Answer 1

.....................
cp=x*89/100=12
SP=12*110/100=13.2

Answer 2

s.p. = 10.68
loss% =11%
let c.p. = x
s.p. = c.p. - c.p. × loss % / 100
10.68= x- x ×11/100
10.68= x- 11x/100
= (100x- 11x)/100. ... ( lcm )
10.68=89x/100
1068= 89 x
x = 12 rs.

s.p. at 10% :-
s.p. = c.p. + c.p. ×profit %/100
= 12 + 12×10/100
= 12+ 12/10
=12+1.2
=13.2 rs. answer