A triangular shaped fin on a motorcycle engine is 0.5-cm thick at its base and 3-cm long (normal distance between the base and the tip of the triangle), and is made of aluminum (k = 150 W/m · K). This fin is exposed to air with a convective heat transfer coefficient of 30 W/m² · K acting on its surfaces. The efficiency of the fin is 50 percent. If the fin base temperature is 130°C and the air temperature is 25°C, the heat transfer from this fin per unit width is
(a) 32 W/m

(b) 47 W/m

(c) 68 W/m

(d) 82 W/m

(e) 95 W/m