Move all terms not containing r to the right side of the equation.
Subtract 1.1 from both sides of the equation.
Subtract 1.1 from 2.5.
Divide each term by 1200 and simplify.
Divide each term in 1200r=1.4 by 1200.
Cancel the common factor of 1200.
Cancel the common factor.
Divide r by 1.
Divide 1.4 by 1200.
Solve for r 1200r+1.10=2.50