For example:
L plus W
3 plus 6= 9
I plus W
4 plus 6= 10
total: 9+10= 19
(this is just an example)
Sarah spent $1,083 because $57*38=$2,166 and $2,166/2=$1083
Do u have an attachment of it ???
the difference from 40000 to the future value in 2020, namely 5 years later is simply the yield or interest amount.

(1.75 + 2 x 0.25 + 5 x 0.05) x 24= 17