It is 525.
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25% of 21000= 25% * 21000= 0.25 * 21000= 5,250
2.5% is the same as 0.025 and 0.025*21000 = 525
42% of 21000= 42% * 21000= 0.42 * 21000= 8,820
4.74% of 21000 = 21000*4.74/100 = 995.4
60 ÷ 100 × 21000 = 12600