Mark bought a set of 6 flower pots of different sizes at a total cost of $8.25. each pot cost $0.25 more than the next one below it in size. what was the cost, in dollars, of the largest pot? $1.75 $1.85 $2.00 $2.15 $2.30

The average pot cost is halfway between the costs of the middle two size pots. It is $8.25/6 = $1.375
The largest size pot is 2.5 times $0.25 more, so costs
  $1.375 + 2.5*0.25 = $2.00


The costs of the pots are
  0.75, 1.00, 1.25, | 1.50, 1.75, 2.00
where the | represents the average cost, halfway between the middle two costs.