Question

a man bought bananas at the rate of 10 for 45 and sold at the rate of 1 dozen banana for rupees 51 find his gain or loss percent

Answer 1

c.p. of 10 bananas = 45
then c.p. of 1 banana = 45/10 = 4.5
S.p. of 12 bananas = 51
then s.p. of 1 banana = 51/12 = 4.25
loss (rupees) = 4.5-4.25 = 0.25
loss(%) = (0.25/4.5)×100 = 5.6% approximately