s the heavy duty aluminum foil than the regular aluminum foil? Express this difference using a ratio as well as a calculated value for the difference?...

How much thicker is the heavy duty aluminum foil than the regular aluminum foil? Express this difference using a ratio as well as a calculated value for the difference?

I need help calculating the ratio

This are the givens that I have:

Thickness of regular foil = .0016cm

Thickness of heavy duty foil = .0023cm

The heavy duty foil is .0007cm thicker than the regular foil.  Please help me figure out the ratio?