8. (10%) Heat flow is given by the equation Q/t = A x AT/R, where the heat flow per time is Q/t, the thermal resistance is R, the area is

A. The difference in temperature on the two sides of the wall is AT in degrees Celsius. If A and AT are constant, and the R value is improved from 4.0 to 14.0, what is the relative heat flow as a percentage in the R 14.0 wall compared with the R 4.0 wall?

Fig: 1