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Let the number of toffees bought at the rate of Rs 20 for 50 be "a"
Then total money invested in these toffees = 20/50 x a = 2a/5
Number of toffees brought at the rate of Rs1.50 each = 2a
Total money invested in these toffees = 1.50 x 2a = 3a
Total cost of toffees to Mohan = 2a/5 + 3a = 17a/5
Total revenue realized by selling them at 20 for Rs 12 = 12/20 x (a + 2a) = 9a/5
Overall loss is 200
So,
17a/5 - 9a/5 = 200
8a/5 = 200
a = 125
total number of toffees purchased = 3a = 375
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