ladybug557
ladybug557 ladybug557
  • 02-01-2018
  • Mathematics
contestada

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

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TaylorBayley
TaylorBayley TaylorBayley
  • 02-01-2018
This can be solved algebraically. Before we start, as context, to find a percentage you multiply by the percentage/100.

[tex]75*x=90 \\ x= \frac{90}{75} \\ \\ \boxed{x=1.2}[/tex]

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