Answer:
$18,750 is the amount sanctuary need to pay back in total after 10 years.
Step-by-step explanation:
Principal Amount = $12,500
Rate of Interest = 5%
Time Period = 10 years
SIMPLE INTEREST = 
So, here the SI = 
or the simple interest on P = $6,250
Now, Amount = Principal + Simple Interest
= $12,500 + $6,250 = $18,750
Hence, $18,750 is the amount sanctuary need to pay back in total after 10 years.