Solve the problem.
1.) Last December, a kilo of sugar cost is 55.This month it costs 95. Find the percent of increase in the price of a kilo of sugar.
2.) A computer store pays 150.00 for an earphone to its supplier. The percent increase is 20%. Find its selling price.
3.) In the school year 2018-2019, 160 parents attended the Grade 6 orientation. While in the school year 2019-2020, 200 parents attended. Find the percent of increase in attendance.

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