If there were ten million barrels in March 1999 and forty million barrels in December 1999, is the increase 40%?
Please help me, I'm really bad with percentages.
2007-09-04 05:59:38 · 3 answers · asked by Madera 2 in Science & Mathematics ➔ Mathematics
To calculate percent change, do this equation:
% change = (New number - Original number)/Original number
So in your case, it would be:
(40-10)/10 = 3.
Multiply that by 100% to make it a percentage:
3* 100% = 300%
Ta-da.
2007-09-04 06:10:43 · answer #1 · answered by Brian L 7 · 0⤊ 0⤋
Nope. 300%.
(40 - 10)/10 = 3 * 100% = 300% increase.
If it were from 40 to 10 it would be:
(40 - 10)/40 = 0.75 * 100% = 75% decrease
Basically, to find % change in a quantity, take the difference and divide by the initial amount. Multiply by 100% to give a percentage.
2007-09-04 13:06:07 · answer #2 · answered by gebobs 6 · 1⤊ 0⤋
10 * x = 40
x = 4 = 400% (minus initial 100%)
2007-09-04 13:07:03 · answer #3 · answered by miggitymaggz 5 · 0⤊ 1⤋