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This question should be relatively easy for a high schooler...
Answer: $5156
Step-by-step explanation:
Given
The rate of interest is 5.7%
time t=7 years
Amount after 7 years, 
for compound interest, the Amount is given by

Put values

Start with

Exponents have the highest priority, so we evaluate 3 cubed first:

Next, we have to solve parenthesis first: we have 27-8 = 19, so the expression becomes

Multiplications and divisions have the same priority, so we perform them as they appear:
, so the expression becomes

Take 1 to the other side as negative
p/2=2
Take 2 to the other side and multiply it
2*2 is 4
So p is 4