To find 10 percent of a number, multiply the number by 0.1. In this instance, 0.1 x 400000000 = 40000000.
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It is 4.0*10^8 in scientific notation
0.028 x 400000000 = 11200000
400000000/1000 = 400000 days = 1095.1 years, approx.
400000000
four hundred million