Margarita's interest and gains on investments for the current year are as follows:

Interest on Madison County school bonds

Interest on U$.$S$.$ government bonds

Interest on a Federal income tax refund

Gain on the sale of Madison County school bonds

$$600$

$700$

$200$

$500$

Margarita must report gross income in the amount of:

a$.$ $$1,400.$

b$.$ $$1,800.$

c$.$ $$2,000.$

d$.$ $$1,300.$