The table shows a consumption schedule.

$\backslash$table$[[$Disposable Income,Consumption$],[$$$300,$$$310],[350,340],[400,370],[450,400],[500,430]]$

Refer to the data above. At the $$300$ level of disposable income:

Select one:

a$.$ The marginal propensity to save is $\mathrm{.}80$

b$.$ The average propensity to consume is $\mathrm{.}60$

c$.$ The average propensity to save is $\mathrm{.}30$

d$.$ There is a dissaving of $$10$