Answers:
(a) 73827.15
(b) 54000
(c) 19827.15
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Work Shown for Part (a)
FV = P*( (1+i)^n - 1 )/i
FV = 300*( (1+0.04/12)^(12*15) - 1 )/(0.04/12)
FV = 73827.1464633265
FV = 73827.15
For more information and examples, search out "future value of ordinary annuity formula".
You can use a TVM calculator to verify the answer.
TVM = time value of money
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Work Shown for Part (b)
15 years = 15*12 = 180 months
($300 per month)*(180 months) = $54,000 total deposit
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Work Shown for Part (c)
Subtract the results of parts (a) and (b)
73827.15 - 54000 = 19827.15
