Answer:
0.8 kg of a certain fruit costs $4.8 and you want to find the cost of 4 kg.
The cost of 1 kg is
[tex]\frac{\$4.8}{0.8\operatorname{kg}}[/tex]Therefore, the cost of 4 kg would be
[tex]\frac{\$4.8}{0.8\operatorname{kg}}\times4\operatorname{kg}[/tex]Hence, the expression
[tex]\frac{4.8}{0.8}\times4[/tex]represents the cost of buying 4 kgs of a certain fruit that costs $4.8 per 0.8 kg.