http://www.olddatsuns.com/620tech.htm
The answer is 620
620
45% of 620= 45% * 620= 0.45 * 620= 279
12% of 620= 12% * 620= 0.12 * 620= 74.4
620
40% of 620= 40% * 620= 0.4 * 620= 248
6% of 620= 6% * 620= 0.06 * 620= 37.2
25% of 620= 25% * 620= 0.25 * 620= 155
It's already there.
The answer is 620
Rounded to the nearest ten it is 620