Here, r1 = 20% and r2 = 5%
? Required percentage
= r1 + r2 - (r1 x r2)/100%
= 20 + 5 - (20 x 5)/100
= 25 - 1
=24%
? Marked price of an article = ? 500
The selling price of article after discount 20% and 10%
= 500 x {(100 - 20) / 100} x {(100 - 10) / 100}
= 500 x (80/100) x (90/100)
= ? 360
Let labelled price of TV = ? R
? SP of the TV = [R x (100 - 20)] / 100 = ? 4R/5
But 16800 - 800 = 4R/5
? x = (16000 x 5)/4 = ? 20000
Here, r = 20% and r1 = 15%
Required profit per cent =[ r(100 - r1)/100] - r1
= [20(100 - 15)/100] - 15
= 17 - 15
= 2%
? Single discount equivalent to 36% and 4%
= 36 + 4 - {(36 x 4)/100} = 38.56
? Required difference
= {(40 - 38.56) x 500}/100 = 1.44 x 5 = ? 7.20
? Marked price of a shirt = ? 320
Discount on a shirt = 320 x 25/100 = ? 80
? Number of shirts has to be purchased to get a rebate of ? 400 = 400/80 = 5
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