Question 1133907
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One response shows the total value of the investment, whereas the question only asked for the amount of interest.<br>
Another response looks as if they are doing the right calculations; but they apparently hit some wrong keys on their calculator.<br>
The third response shows the right answer, but without showing any work; so it is maybe of little use to you.<br>
The right calculations are these:<br>
$5600*0.90 = $5040  [he sold it for 90% of what he paid for it]
$5040-$1310 = $3730   [he spent $1310 of it]
$3730*0.06*3 = $671.40   [interest = principal (original amount) times rate (annual percentage) times time (years)]