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let the original price be 100
final price =90% (80% (60%of 100)
=90/100×80/100×60/100×100
=43.20
original discount =100-43.20
=56.8%
final price =90% (80% (60%of 100)
=90/100×80/100×60/100×100
=43.20
original discount =100-43.20
=56.8%
rk7777:
43.2 is correct answer according to book
book is wrong. let 100 be the original price. after 10%discount, it becomes 90. (100-10/100*100=90). now with 20% discount (90-20/100*90=90-18=72). now the price is 72. now for 40% discount (72-40/100×72=72-28.8=43.2). so after successive discounts of 10%, 20% and 40%, we have the final price as 43.2. so we got an effective discount of 100-43.2=56.8. in book may be the answered the final price after discounts
hope this helps
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