How can i use compatible numbers to estimate the quotient of a decimal and whole number

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

5,678.321 what place value is the 1 in

Me find the answers and explain the process to find the answer of the problem appreciate it : )