Andrew and andrea want to start a collge fund for their baby girl . they decide to pu lt money into an investment that is expected to earn 4.2% simple interest each year. how much would they have to deposit now in order to accumulate $100,000 by the time their newborn goes to college in 18 years ? the formula for simple interest is a = p + prt , where a is the accrued value of the investment after t years , r is the interest rate ( expressed as a decimal ) and p is the starting principal invested . round your answer up to the nearest cent