$6$Cousin Berta invested $$150,000$ fifteen years ago at $12$ percent, compounded quarterly.a$.$ How much has she accumulated? $($Use a Financial calculator to arrive at the answer. Round the final answer to the nearest whole dollar.$)$Future value$b$.$ What is her effective annual interest rate $($rate of return$)?($Use a Financial calculator to arrive at the answer. Round the final answer to $2$ decimal places.$)0$:$42$:$22$Effective annual interest rate