822
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About 22%
hcf is 100 lcm is 4000 500 = 22 x 53 800 = 25 x 52 hcf = 22 x 52 = 100 lcm = 25 x 53 = 4000
well, I would say that 39 is about 40, and 22 is about 20, so 40*20=800
Best estimate is 20 x 40 = 800 Actual answer is 22 x 39 = 858
800 + 800 + 800 + 800 + 800 = 4,000