If $400 is invested at the rate of 6% for one year, what will be the total value of the investment (the amount)?

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Answer 1 · 2017-11-17T10:44:15

#$424.00#

Sowing you a slightly different approach with explanation of how we get there.

We end up with #color(red)((106)/100xx$400)#
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#color(blue)("This is how the final expression is derived")#

Percentage is just a fraction but a special one in that the bottom number (denominator) is always set at 100.

So, as a fraction, all of something is

#1xx" whatever it is"=>100/100xx" whatever it is"#

So in this case we have all of the $400 + a bit of the $400

#(100/100xx$400)+(6/100xx$400)#

Factoring out the $400 we have:

#$400(100/100+6/100) ->color(red)($400xx106/100)color(blue)( = $424)#
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Trick for non calculator

#$400xx106/100# is the same as #$400/100xx106 -> $4xx106=$424#