Hello I have an economics math equation and have provided the question via image. I need help with

Scenario 10.2 A hypothetical open economy has a marginal propensity to import (MP1) equal to 0.2 and a marginal propensity to consume equal to 0.7. Assume that the economy is initially in equilibrium. Refer to Scenario 10.2. What is the marginal propensity to save of this economy? 0 3.0.2 0 b.0.7 O c.0.6 O d.0.3 0 e. 0.9