You have to imagine in such problems that numbers like 22.00 of which you want to find a certain percentage of is to start with represents 100%
Hence here 22.00 represents 100%
So 1% of 22.00 is 22.00/100
And so 20% of 22.00 = (20) x (22.00/100) = 20 x 0.22 = 2 x 2.2 = 4.4
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20% of 2200 = 20% * 2200 = 0.2 * 2200 = 440
50 percent of 2200 = 110050% of 2200= 50% * 2200= 0.50 * 2200= 1100
7.3% of 2200= 7.3% * 2200= 0.073 * 2200= 160.6
45% of 2200= 45% * 2200= 0.45 * 2200= 990
66% of 2200= 66% * 2200= 0.66 * 2200= 1,452