#### Answer

estimated cost = 21600
actual cost = 21780

#### Work Step by Step

The number of months in 3 years is given by:
12 x 3 =36
Cost of lease per month = 605
Therefore, the estimated cost of the lease for 3 years is:
= 600 x 36
= 21600
The actual cost of the lease = 605 x 36 = 21780