Respuesta :

texaschic101
there r 2 ways to do this type of problem....

(1) 30% of 70...turn percent to decimal...." of " means multiply
     0.30(70) = 21.....so 30% of 70 is 21

or

(2) use the percent formula.....is/of = %/100
      30% of 70 is what ...
      is = x
      of = 70
      % = 30

is/of = %/100
sub
x / 70 = 30 / 100
cross multiply because this is a proportion
(100)(x) = (30)(70)
100x = 2100
x= 2100 / 100
x = 21
** by the way, this percent formula works on many percent problems...u just have to make sure u sub the right numbers in the right places.

either way u choose to do it, u should arrive at the same answer
gahorslvr1
The easiest way to say 30% of 70 is to turn it into a multiplication problem. 
You will want to take 70 x .30 because when you change a percent you move the decimal over to the left. So then when you multiply 70x.30=21 your answer will be 21. So if you are saying you will have something on sale and it is 30% off and $70.00 is your normal price you will then take $21.00 off of $70.00 to get your Sale price. :) Hope this helps. But your final answer in this case is 21.

Otras preguntas