Let Initial value = 100
Discounted value = (100Â - 10)% of (100 - 15)% of (100 - 18)% of 100Â
i.e; 90% of 85% of 82% of 100 =Â $$\frac{90}{100}\times\ \frac{85}{100}\times\ \frac{82}{100}\times\ 100$$
Discounted value = 62.73Â
Equivalent discount =Â $$\frac{initial\ value-discounted\ value}{initial\ value}\times\ 100$$
=Â $$\frac{100-62.73}{100}\times\ 100=37.27\%$$
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