Question

david bought 100 eraser for rup 250.he was not very good at calculation and made a mistake in fixing his selling price. when he sold his eraser he incurred a total loss equal to the selling price of 25 eraser find his loss percent

Answer 1

so,cost of 1earaser=250/100=2.5
sp of 25earaser=25×2.5=10
so,loss%=10/25×1/10×100
=4%

Answer 2

c.p = 250

let s.p of 1 eraser =x

s.p of 25 eraser = 25x (=loss)

s.p of 100 eraser =100x

loss =c.p - sp

25x = 250-100x

x = ₹2

so s.p of 1 eraser = ₹2

s. p of 25 eraser = ₹50 (= loss)

loss% =( loss×100)÷ c.p

= (50x100)÷250

loss% = 20%