A Rs 100 shirt is offered at 10% discount and a Rs 300 pair of trousers at 20% discount. If Pritam bought 1 shirt and 3 pairs of trousers, what is the effective discount (in %) he got?
Pritam bought 1 T shirt and 3 pairs of trousers
SP of 1 t shirt = $$\frac{100-10}{100}\times 100 = 90$$
SP of 3 pairs of trousers = $$3 \times \frac{100-20}{100}\times 300 = 720$$
Total SP = 90+720 = 810
CP of 1 shirt and 3 trousers = 100 + 3(300) = 1000
discount = 1000 - 810 = 190
% discount = $$\frac{190}{1000}\times 100 = 19$$%
so the answer is option A.
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