Natalie charges $1,490 per month to rent each of her three rental houses. natalie must pay $5,850 in maintenance costs per house per year. if all three houses are occupied, how much money will natalie earn over seven years?

Amount of rent charged by Natalie per house = $1490
Number of houses Natalie has = 3
So
 Amount of rent Natalie gets from 3 houses per month = (3 * 1490) dollars
                                                                                           = 4470 dollars
Amount of money Natalie gets from 3 house per year = (12 * 4470) dollars
                                                                                     = 53640 dollars
Amount of money Natalie
 pays for maintenance per house per year = $5850
Then
Amount of money Natalie
 pays for maintenance of 3 houses per year = (3 * 5850) dollars
                                                                      = 17550 dollars
Then
Amount of money earned by Natalie in 1 year = (53640 - 17550) dollars]
                                                                         = 36090 dollars
Amount of money earned by Natalie in 7 years = (7 * 36090) dollars
                                                                           = 252630 dollars.