Calcutate these values:
a: increase 65kg by 30%

b: decrease 82cm by 7%

c: increase $350 by 15%

d: decrease $500 by 22%

A) 84.5 kg

              B) 76.26 cm

              C) $402.50

              D) $390.00

Step-by-step explanation:

Increase means "ADD the rate to 1".

Decrease means " SUBTRACT the rate from 1".

The rate should should be in decimal form (move the decimal two places to the left to convert a % to a decimal).

A) 65(1 + 0.30)

 =  65(1.3)

=   84.5

B) 82(1 - 0.07)

=  82(0.93)

=  76.26

C) 350(1 + 0.15)

 = 350(1.15)

 =  402.5

D) 500(1 - 0.22)

=  500(0.78)

=  390

the answer is 200

step-by-step explanation:

the way the question is worded, it seems to imply the $264 interest is simple interest, not compound interest.

the simple interest for 2 years is $264; the simple interest for 1 year is $132.

$132 interest on a $600 investment means an interest rate of (132/600)*100 = 22%.

the value of $200 at 22% interest compounded annually for three years is

200%281.22%29%5e3

the amount of interest is that value, minus the original $200.

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