Assume a nation is starting with zero national debt. If government outlays and tax revenue are as shown, and the nation's GDP is $12 billion at the end of Year 3, what is its debt-to-GDP ratio at that time? Round to the nearest whole percent. 33% Both Social Security and Medicare are government programs concentrated on the [blank] population. Social Security is focused on providing [blank], while Medicare provides [blank] for retired persons. For people to receive Social Security and Medicare payments, they must have [blank] the program when they were[blank]. Upon [blank], they become eligible for payouts. elderly; retirement income; health care; paid money into; working; reaching retirement age