The actual amount that should be credited is $757.58.
Solution:
Given that,
2% Discount if paid in 10 days.
1% Discount if paid in 15 days, (but greater that 10 days)
Net due in 60 days.
That is,
will close the acount on days 1-10
will close the acount on days 11-15
And August 8 is Day 15 and falls under the 1% discount rule.
Therefore, we have to divide the partial payment by the complement of the discount rate.
from the balance, and
is due by day 60.