If you mean: 4 and 79/80 then it is 4.9875
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Multiply both numbers by 20 to read 80/100... 80/100 = 0.80
80% = 4/5 or 0.8
4/5 is the simplest form. 0.8 is the same as 80%, because 80% is the result of moving the decimal over two places to the right. 80% is the same as 8/10, and 8/10 simplified is 4/5.
7/4 as a decimal is 1.75
4/10 as a decimal is 0.4