$12\mathrm{.}5\%$ per year on their investments.

a$.$ How much would they have to save each year to reach their goal?

b$.$ If they think you will take five years instead of four to graduate and decide to have $$170,000$ saved, just in case, how much would they have to save each year to reach their new goal?

a$.$ To reach the goal of $$130,000,$ the amount they have to save each year is $$.($Round to the nearest cent.$)$