If you need a 1,300 square foot rental house painted, how much should the painter charge you to paint that house?

The painter should charge you $3,250 to paint that house.

Missing info:
A painter charges by the square foot and charges you $1,875 to paint a 750 square foot rental house.

y = kx
y = total payment to painter
x = number of square foot painted
k = unit price of 1 square foot painted

Given: y = 1875 ; x = 750 ; k = ?
k = y / x ⇒ k = 1875/750 ⇒ k = 2.50 per sq. ft

y = ? ; x = 1300 ; k = 2.5
y = kx
y = 2.5 * 1300
y = 3,250

If cheese is $4.40 per kilogram, you should pay .88