Let's consider a simple macro model where there is no foreign sector. a marginal propensity to save of mps $=0\mathrm{.}1,$ and a marginal income tax rate of t $=1/3.$ If autonomous saving

decreases by $300,$ which of the following is true?

$•⁠⁠$total consumption will increase by $300$

$•⁠⁠$national income will increase by $500$

$•⁠⁠$disposable income will increase by $750$

$•⁠⁠$the budget surplus will increase by $250$