Question

Suppose that you plan on taking a summer job selling magazine subscriptions. The magazine company will pay you $1.25 for selling the first subscription. For each

additional subscription sold, the magazine company will pay you 5 cents more than what was paid for the previous subscription. How much will you earn by selling
150 magazine subscriptions?

PLEASE HELP

Answer 1

• here a=1.25
• d=0.05

`\\ \bull\tt\dashrightarrow a_(150)=a+149d`

`\\ \bull\tt\dashrightarrow 1.25+149(0.05)`

`\\ \bull\tt\dashrightarrow 1.25+7.45`

`\\ \bull\tt\dashrightarrow 8.70`

• l=8.70

`\\ \bull\tt\dashrightarrow S_n=(n)/(2)[a+\ell]`

`\\ \bull\tt\dashrightarrow S_(150)=(150)/(2)[1.25+8.70]`

`\\ \bull\tt\dashrightarrow S_(150)=75(9.95)`

`\\ \bull\tt\dashrightarrow S_(150)=745.46`

You will receive $746.46.