The government gives stimulus checks of $800 to 50 million families in the United States. Each of these families spends 50% of their check this year and saves the rest. Assuming no other changes in the spending of these families and that the goods they purchased were entirely produced in the United States, the stimulus program added how much to US GDP? O a. $25 billion O b. None of these O c. $20 billion O d. $5 billion O e. 545 billion