If the interest rate on a charge card is 1.25% on the unpaid balance and your unpaid balance this month is $312, how much interest will you pay this month?
p. s. the answer is 53.90, i dont know how though.

Pranav and molly are selling pies for a school fundraiser. customers can buy blueberry pies and pumpkin pies. pranav sold 6 blueberry pies and 4 pumpkin pies for a total of $106. molly sold 6 blueberry pies and 3 pumpkin pies for a total of $90. find the cost of each of one blueberry pie and one pumpkin pie