Before starting the new job, Hassan Mustafa and his wife, Dana, were discussing how to plan

for their three young sons$$ university education. Stephen turned $12$ years old in April, Jack

turned $9$ in January. and Danny turned $7$ in March. Although university was still a long way off

for the boys. Hassan and Dana wanted to ensure enough funds were available for their studies.

Hassan and Dana decided to provide each son with a monthly allowance that would cover

tuition and some living expenses. Because they were uncertain about the boys' finding summer

jobs in the future, Hassan and Dana decided their sons would receive the allowance at the

beginning of each month for four years. The parents also assumed that the costs of education

would continue to increase.

Stephen would receive an allowance of $$1000$ per month, starting September $1$ of the year he

turns $18.$

Jack would receive an allowance that is $8\%$ more than Stephen's allowance. He would also

receive it at the beginning of September $1$ of the year he turns $18.$

Danny would receive an allowance that is $10\%$ more than Jack's at the beginning of September

of the year he turns $18.$

Hassan and Dana visited their local bank manager to fund the investment that would pay for

the boys' allowances for university. The bank manager suggested an investment paying interest

of $4\mathrm{.}0\%$ compounded monthly, from the day of the investment until the three boys had each

completed their four years of education. Hassan and Dana thought this sounded reasonable.

So$,$ on June $1,$ they deposited the sum of money necessary to finance their sons' post$-$secondary

educations.Create a timeline of events for each of the sons.