How Fast is the Sun Losing Mass Due to Radiation?

[aeromat]

Homework Statement

The Sun radiates away energy at the rate of 3.9*10^24 Watts. At what rate it it losing mass due to this radiation?

Homework Equations

E = Δmc^2
E = mc^2 - m0c^2

Where m0 rep. rest mass.

The Attempt at a Solution

For this one, I am unsure as to how I would go about with solving it.
I know that a Watt can equal 1 Joule / second...

 

[lewando]

I know that a Watt can equal 1 Joule / second...

So then the Sun must radiate energy at 3.9*10²⁴ Joule / second.

It will help if you consider a useful time interval, say 1 second, for your evaluation.