The amount of interest earned on A for one year is 336, while the equivalent amount of discount is 300. Find A.
Correct answer: $A=2800$
My work: From the interest, I get that $A(1+i)-A = 336 \iff Ai = 336$
However, I'm not sure how to interpret the discount part. It's clearly not what I interpreted it as, which was
$A-A\nu = 300 \iff A - A\frac{1}{1-d} = 300 \iff A-A(1+i) = 300 \iff -Ai = 300?$
HINT: you have two equations. If we set $k=r+1$, where $r$ is the rate of interest, the first equation is $Ak-A=336$, the second is $ A- A/k=300$. Now solve the system.