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lana [24]
4 years ago
13

A student raises her grade average from a 75 to a 90. What was the percent of increase

Mathematics
1 answer:
son4ous [18]4 years ago
4 0
This can be solved algebraically. Before we start, as context, to find a percentage you multiply by the percentage/100.

75*x=90 \\ x= \frac{90}{75}  \\  \\ \boxed{x=1.2}

This tells us that 90 is 120% of 75. However, your question wants us to find the <em>increase</em>, therefore we don't need that 100.
Therefore, the increase is 20%.
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