Question

The number of bacteria in a petri dishes 524 and growing at a rate of 7% every month how many bacteria will be there in seven months

Answer 1

7% = 0.07

 since it is growing add that to 1 = 1.07

 now that is to the power of length of time 1.07^7

now multiply

524 x 1.07^7 = 841.429 ( round answer as needed)

Answer 2

If something is growing at a rate of 7% a month, that means you take the original amount and multiply it by 0.07 and then add it to the original amount.

Luckily, there is a quick way of doing this.  Just take the original amount and multiply it by 1.07.  Since there are a total of 7 months, we must multiply the original amount by 1.07 seven times.

So our answer is:

524 * 1.07^7 =

841.429 bacteria