2 years ago in 1990 the number of children infected with polio was 3125. What was the number of infections in 1992 when vaccination reduced the number of infections by 4 percent per year?
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number of children infected with polio in 1990=3125
By vaccination number of infected children reduced by 4 percent per year
number of children infected with polio in 1992=3125-(8÷100×3125)
=3125-250
=2875
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