If a man earns $420 interest in one year at 7%, what was the amount of money invested?

Question

anonymous · Answer

If a man earns $420 interest in one year at 7%, what was the amount of money invested? 



$29.40
$60.00
$600.00
$6,000.00

anonymous · Answer

420 = [principle](.07)^n , where n is the years, this case 1

anonymous · Answer

420/.07 = principle investment

anonymous · Answer

@Fazeelayaz is incorrect

anonymous · Answer

what would it be then???

anonymous · Answer

yes sory the formula is     Sn=ar^n

anonymous · Answer

Sn is sum   a  is in this case principle investment and r is  ur iinterst

anonymous · Answer

?

anonymous · Answer

if u have studied geometric serries then there is a formula if serries increases by addition of certain amount     S=a*r^n

anonymous · Answer

oh ok soo what would the answer be to the question???

raden · Answer

let "x" is the amount of money invested, so it can be
(7/100)*x = $420
x = $6,000.00

anonymous · Answer

How much pure water must be mixed with 10 liters of a 25% acid solution to reduce it to a 10% acid solution? 
11 L
15 L
25 L

anonymous · Answer

please help me

anonymous · Answer

dilution problem: (10 L)(.025 M)=(X L)(.10 M)
solve for X