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Andrea wants to buy a $755 bicycle. She has no money saved, but will be sble to deposit $40 into a savings account when she recieves her paycheck each friday. However, before andrea can buy the bike, she must give her sister $45 that she owes her. For how many weeks will Andrea need to deposit money into her savings account before she can pay back her sisterr and buy the bike?

Respuesta :

Answer:

About 21 weeks

Step-by-step explination:

Her bike is 775 dollars. Lets start there.

She will deposit  40 dollars every Friday, or, every week.

With this logic, we would only need 20 weeks. I found this by doing 775/40.

BUT

We have one more complication. Andrea owes 45 dollars to her sister. It is important to note that this is a ONE TIME payback. This is NOT weekly.

Here is how we will do it:

Andrea needs 775(bike)+45(sister)=820 dollars in debt

820/40 a week=20.5 weeks.

Since .5 of a week is 3.5, and I don't think .5 of a day applies here, we will round up and say that andrea will need roughly 21 weeks to earn all the money she needs.

Final answer: 21 weeks

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