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Solution
x = 130-100
x = 30
If 90 is increased by x%, then it becomes 117.
90 of (100+x)% = 117
$$90\times\frac{(100+x)}{100}=117$$
$$\frac{(100+x)}{10}=13$$
(100+x) = 130x = 130-100
x = 30
Value of x = 30
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