What do i do next? do i convert the fraction into a decimal?

The table shows the webster family’s monthly expenses for the first three months of the year. they are $2,687.44, $2,613.09, and $2,808.64. what is the average monthly expenditure for all expenses?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Which letters from the table represent like terms? a and b b and c a and d b and d