210 x 10 = 2100
220 x 10 = 2200
230 x 10 = 2300
240 x 10 = 2400
250 x 10 = 2500
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2110. 2100+10=2110
210
To be a multiple of 4, 10 and 20 the number must be a multiple of their lowest common multiple. lcm(4, 10, 20) = 20 What is required is a multiple of 20 between 61 and 107. The numbers 80 and 100 both satisfy the problem of being between 61 and 107 and being a multiple of 4, 10 and 20.
16
10% is 2500