Draw a circular$-$flow diagram. Identify the parts of the model that correspond to the flow of goods and services and the flow of dollars for each of the following activities. a$.$ Selena pays a storekeeper $$2$ for a litre of milk. $(2$ marks$)$ b$.$ Stuart earns $$15$ per hour working at a fast$-$food restaurant. $(2$ marks$)$ c$.$ Shanna spends $$30$ to get a haircut. $(2$ marks$)$ d$.$ Salma earns $$10000$ from her $10$ percent ownership of Acme Industrial. $(2$ marks$)$