Jannetta and George each made apple juice. Jannetta mixed 12 fluid ounces of apple concentrate with every quart of water to make
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The formula for population growth is written as , where t is the growth factor.
And the formula for growth factor is b = 1+r , where r is the rate of increase
So for our question
b = 1.15
that implies
1+r = 1.15
subtract 1 from both sides
So , r= 0.15
So to change in percent , multiply by 100
we get
r= 15%
rate of increase = 15%