i am pretty shore it is 0.25
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.025 is twenty five thousandths. 25,000 is twenty five thousands.
.025 percent Solution Method: 250 ppm = the ratio 250:1,000,000 = the fraction 250/1,000,000 = the decimal value 0.00025 = the percentage .025 (i.e. 0.00025 * 100)
.025 Keep in mind one percent = .01, that makes it easier to solve questions involving %'s!
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equivalent fraction to .025 = 1/400.025 * 1000/1000 = 25/1000 or 1/40 in fraction in lowest term