Answer: $2875
Explanation:
The formula to calculate the simple interest is given by :-
, where P is the principal amount , r is the rate of interest and t is the time period.
Given: Principal amount = $2500
Rate of interest = 15%=0.15
Time period = 1 year
Now, the simple interest gained by Darrel after 1 year will be :-
![S.I.=2500* 0.15* 1=\$375](https://img.qammunity.org/2019/formulas/mathematics/middle-school/x65v7rjkrjkpc8kw2g900du509fzgqaft1.png)
Now, the total amount his friend owed altogether=
![P+I=2500+375=\$2875](https://img.qammunity.org/2019/formulas/mathematics/middle-school/txtqzfdmvosl2bgspfkaywslhjb2mmy9jf.png)