The following is the consumption schedule for the economy on the planet of Tatooine. Additional relevant information for this planet and it's economy is as follows: the government on Tatooine spends$60 billion, the ambient daytime temperature is roughly 120F, the economy is a net importer of$30 billion, total investment is set at$15 billion, and the Cantina Band will be performing all week. (The symbol$represents the local currency, also known as Republic Credits.)

Real GDP (billions per year)

Consumption (in billions per year)

0

105

150

180

300

255

450

330

600

405

What is the marginal propensity to consume for this economy?