Jake had these daily balances on his credit card for his last billing period. He did not

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Jake had these daily balances on his credit card for his last billing period. He did not pay the card in full the previous month, so he will have to pay a finance charge. The APR is 18.6%.
Two days @ $331.98
Eleven days @ $1,203.04
Four days @ $996.71
Thirteen days @ $1,002.76
a. What is the average daily balance?
b. What is the finance charge?
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