Verified answer

1/5 of 20melons = 4melons

leaving 16melons

16melons x£1.50 the selling rate

£24 total money

£24-£20 total money - cost of melons

£4 profit

20 melons = 15

1 melon = 15/20 = 0.75

1/5 of melons bad = 20/5 =4

good = 20 - 4 =16

1 melon sales rate = 1.50

16 melons = 16x 1.50 =24

profit = 24 - 15 = 9

20 melons bought for 15 lbs or .75 lbs each

1/5 of 20 or 4 were thrown away

Sold remaining 16 melons at 1.5 lbs each or 24 lbs profit 9 lbs

1/5*20=4 - bad

16 left

16*£1,5=£24

24-15=£9

{(20*4/5)*1.5}-15=24-15=£9