On the first day the cost is $20
Over the next 5 days the price decreased by 2
So, day 1- $20
Day 2- $18
Day 3- $16
Day 4- $14
Day 5- $12
Day 6- $10
We'll then add them all to find the total over 6 days
$20+$18+$16+$14+$12+$10= $90
Over all six days, the total price is $90
