Jenny loaned Frank $30.00 and charged him $0.05 daily interest. Of Frank pays her $5.50 per week, how much does he owe Jenny at the end of three weeks?

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is