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Below are the answers:
a. <span>An = Ao • 2^(t/30)
b. </span>An = 1500 • 2^(60*2/30) <span>or An = 24000
</span>c. <span>4000 = 1500 • 2^(t/30)
</span>or 4000/1500 = 2^(t/30)
<span>or ln(40/15) = (t/30) ln(2) </span>
<span>or t = 30* ln(8/3) / ln(2) </span>
<span>or t ~ 42.45 min</span>
A=bh/2 15x10.3= 154.5/2 the answer is 77.25
Tax is 1.54
Including tax = 39.99
Excluding tax= 38.5
Hope this helps