A towel ,when bleached, was found to have lost 20% of its length and 10% of its breadth , the percentage of decrease in area is :
Let original length = `x` and original breadth = y
Decrease in area = `xy - (80/100 x xx 90/100 y)`
= `(xy - 18/25 xy) = 7/25 xy`
`:.` Decrease % = `( 7/25 xy xx 1/xy xx 100)`% = 28%
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