SOLUTION: Yesterday you borrowed $20 from your brother. Every day that you don't pay back, you owe $.50 more. So today, day one, you owe him $20.50, on day two you will owe him $21.00, on da

Algebra ->  Test -> SOLUTION: Yesterday you borrowed $20 from your brother. Every day that you don't pay back, you owe $.50 more. So today, day one, you owe him $20.50, on day two you will owe him $21.00, on da      Log On


   

Question 986434: Yesterday you borrowed $20 from your brother. Every day that you don't pay back, you owe $.50 more. So today, day one, you owe him $20.50, on day two you will owe him $21.00, on day three you will owe him $21.50, etc. if you still haven't paid him back his much will you owe him on day 25?
Found 2 solutions by Fombitz, MathTherapy:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
T=20%2B0.5%2AN for each day you don't pay.
So when N=25,
T=20%2B0.5%2A25
T=20%2B12.50
T=37.50

Answer by MathTherapy(10557) About Me  (Show Source):
You can put this solution on YOUR website!
Yesterday you borrowed $20 from your brother. Every day that you don't pay back, you owe $.50 more. So today, day one, you owe him $20.50, on day two you will owe him $21.00, on day three you will owe him $21.50, etc. if you still haven't paid him back his much will you owe him on day 25?
Let amount owed after d days be A(d)

Then we get the equation: A(d) = 20 + d(.5)

With d, or number of days being 25, we get: A(25) = 20 + 25(.5)

A(25) = 20 + 12.5

A(25), or amount owed on day 25 = highlight_green%28%22%24%2232.50%29