Answer:
$9,375
Step-by-step explanation:
We are to calculate what the bond rate is now.
Using the simple interest formula:
Simple interest = Principal × Rate ×Time/100
Given
Amount = $15000
Time = 10years
Rate = 6%
Required
Amount invested (principal)
SI = PRT/100
Also SI = Amount - Principal
SI = A-P
The formula becomes
A-P = PRT/100
Substitute the given value.
15,000- P = P(6)(10)/100
15000-P = 6P/10
15000-P = 0.6P
15000 = 0.6P+P
15000 = 1.6P
Divide both sides by 1.6
15000/1.6 = 1.6P/1.6
9,375 = P
Principal = $9,375
This means that the amount invested in the savings bond is $9,375