Converting Matter to Power: Calculating Mass for 3200W of Energy for 3 Days

[Ethan_Tab]

Homework Statement

What mass of mater would be converted to energy to provide 3200W of Power for 3 days?

Homework Equations

P=E/t
E=mc²

The Attempt at a Solution

[/B]
E=P*t
Subbing mc² for energy I get

mc²=P*t

m=P*t/c²

m=(3200W*3Days)/(9X10¹⁶m²/s²)

m= 1.066X10^-13kg

This answer is incorrect.
What am I missing?

 

[SteamKing]

What's the definition of a watt?

Have you used consistent units, or did you just throw all your numbers in a big churn and crank out a meaningless answer?

 

[Ethan_Tab]

I threw all my numbers in a big churn and cranked out a meaningless answer.

3 Days= 259200s

Doing the same calculation I get 9.216X10^-9kg

Thank you :)