You want to study at the hogwarts school of witchcraft and wizardry after three years. you need 910910 pieces of muggle-money to study there. you decide to deposit some pieces in the bank at an annual interest rate of 10\%10%. how many pieces should you deposit today if you want to use the total amount to pay the fees?

You should deposit 700 pieces today if you want to use the total amount to pay the fees.

Step-by-step explanation:

Suppose, you should deposit number of pieces today.

Formula for simple interest:     , where I = Amount of interest, P= Initial deposit amount, r= rate of interest in decimal form and t= time duration.

Here, the number of pieces is deposited at an annual interest rate of  10% for three years. That means,   and

Using the above formula, we will get.......

Given that, you need total 910 pieces of muggle-money to study after three years. So, the equation will be......

So, you should deposit 700 pieces today if you want to use the total amount to pay the fees.

a. she will receive a refund of $278.

step-by-step explanation: