1 Answer

Vitaly Berg · Answer 1 · 2017-07-01T15:52:02+0000

Simplest way to do this:
number of books= 120
percentage represented by 120= 100%
increase current percent by 55%= 155%

: . 55% increase = original number of books * (155%)
= 120 * (155/100)
= 186

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