salary after the tax into a retirement account at the end of every year for the next 30

years. Suppose that annual return is 5%, and his current salary before tax is 80k which

grow 3% per year. The tax will apply as 15% on the salary up to 50k and it is 20% for the

salary interval of 50k and 80k and the tax rate will be 25% for the remaining salary more

than 80k (for example if his salary will be 105k, he is paying 15% tax on his first 50k and

20% in the next 30 k and 25% on his next 25k of his salary). then:

a) Create a spreadsheet which shows Matthew the balance of retirement account for

various levels of annual investments and returns. (3 marks)

b) If Matthew aims to gain $1,500,000 at the end of the 30 th year, what percentage of

his salary he should put in the investment annually.