Multiply the denominator by the whole number, add that total to the numerator, put the whole thing over the original denominator.
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87/10 IS a mixed fraction so you do not need to do anything to "convert" to a fractional notation.
You can either add the fractional parts and, if required, convert the answer to a mixed fraction and then add the integer part to the integer parts of the two original numbers; or change both numbers to top-heavy (or improper) fractions, add them and then convert the answer to a mixed fraction.
Divide the percentage number by 100 to convert it to a fraction. If the answer consists of an integer part and a fractional part then you will have a mixed number.
I wouldconvert both to improper fraction,find a common multiple (CM),calculate equivalent fraction with CM as the denominator,add the numerators,change the improper fraction to a mixed fraction, if required,simplify the fractional part of the mixed fraction - if appropriate and required.
0.06 is the decimal fraction equivalent to 6/100. As a mixed number then 6.06 = 66/100. As an improper fraction then 6.06 = 606/100.