Final answer:
The rate is $6.20 for 3.8 pounds of grapes. In fraction form, the rate is $6.20/3.8 pounds. The unit rate, or cost per pound, when calculated and rounded to two decimal places is approximately $1.63 per pound.
Step-by-step explanation:
To identify the rate of the cost of grapes in fraction form and calculate the unit rate, we follow these steps:
Write down the given rate: It costs $6.20 for 3.8 pounds of grapes.
Express this as a fraction: $6.20/3.8 pounds.
To find the unit rate, which is the cost per pound, divide the total cost by the number of pounds: $6.20 ÷ 3.8 pounds.
Perform the division: $6.20 ÷ 3.8 = $1.6316 per pound, when rounded to four decimal places.
Therefore, the unit rate is approximately $1.63 per pound when rounded to two decimal places.