Stefan-Boltzmann Law Questions

A black body at $227^{\circ }\text{C}$ radiates heat at the rate of $7{\text{Cals/cm}}^2\text{s}$. At a temperature of $727^{\circ }\text{C}$, the rate of heat radiated in the same units will be:

The total radiant energy per unit area, normal to the direction of incidence, received at a distance $R$ from the centre of a star of radius $r$, whose outer surface radiates as a black body at a temperature $T\text{ K}$ is given by: