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83.2
Adding four percent to a number is the same as multiplying the number by 1.04. In this instance, 1.04 x 80 = 83.2. therefore, 80 increased by 4 percent is equal to 83.2.
30 + 4% = 30*1.04 = 31.2
1.04 x 1.9 = 1.976
"...increased by four percent" is a fragment because it lacks a subject. WHAT increased by four percent?