315+63 = 378
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31500 is a factor of 31500
79.2adding 20% to 66:=66 + (20% * 66)=66 + (0.20 * 66)=66 + 13.2= 79.2
The first step to answering this question is to work out what 20% of 105 is. This can be done by multiplying 105 by 20% (or 20/100). That gives us 21, which we then need to add to 105: 21+105 = 126. Thus the answer to 105 plus 20 percent is 126.
20% of 20% is 4% (=0.04)
75 [lots] of 420 = 31500.