Sabrina purchased 3/4 pound of apples and 1/2 pound of nuts. what is the total cost of these items to the nearest cent?

the complete question is
Sabrina purchased 3/4 pound of apples and 1/2 pound of nuts.What is the total cost of these items to the nearest cent?$4.93$5.86$9.22$18.89 apples $2.49/lb Nuts $7.98/lb potatoes$0.99/lb onions $1.29/LB

we know that
apple cost> $2.49/lb
nuts cost> $7.98/lb
therefore

total cost=2.49*(3/4)+7.98*(1/2)> 1.8675+3.99> $5.8575> $5.86

the answer is
$5.86

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What's the denominator