Sean wants to buy a bike. bike a costs $130. bike b costs $160 but is on sale for 20% off the original price. which bike is the better buy for sean?

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