A Bimetallic Strip Is Made Out of Two Strips of Metal

A bimetallic strip is made out of two strips of metal bonded together. Each strip is 20.0 cm long and 1.00 mm thick. One strip has a coefficient of thermal expansion 4.00 × 10^-6/K and the other has a coefficient of thermal expansion 3.00 × 10^-6/K. At 20.0°C the strip is straight. What is the inner radius of curvature of the composite strip at 200°C?

A) 15.2 cm
B) 2.22 m
C) 1.27 m
D) 34.8 cm
E) 5.56 m