Hi

how such exercice can be solved using the arithmetiquie increase annuity formula where the payment is more frequent than the interest period and we are using the constant increase for each interest period

$(4)$ Cassandra receives an annuity$-$due with a payment each month. The

annuity has its first payment on her $12$th birthday and the last payment

is on her $16$ th birthday. The amount of the payment is $$100$ times her

age with no credit being given for fractions of a year. All the deposits are

made to an account earning compound interest at an annual effective

interest rate of $5\mathrm{.}82\%.$ Find the accumulated value on her $18$th birthday.