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Jim invested in ford motors.  He gained 10 % of his investment, giving him $50.  What was his initial investment?
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Arthur D. | Effective Mathematics TutorEffective Mathematics Tutor
5.0 5.0 (6 lesson ratings) (6)
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The wording is a little ambiguous.
Is $50 what he earned from his investment ?
If so, 10 % of what number is $50 ?
10%*n=$50
0.1*n=$50
n=50/(0.1)
n=500/1
n=$500 invested at 10 %
Jim S. | Physics (and math) are fun, reallyPhysics (and math) are fun, really
4.7 4.7 (143 lesson ratings) (143)
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Vicki,
 
Let I0 be the initial investment then 50=I0(1+.1) so solving for I0 gives I0=50/(1.1)=45.45. So he must have started with $45.45.
 
Jim