A test coupon was attached to a bridge so it could be periodically evaluated for

corrosion. The coupon has same composition as the steel used on the bridge. The coupon has the

size of $3$inch x $5$inch, with its back side and edge painted, but the front side exposed to the

elements. During a $30-$day period, the coupon was found to have lost its weight by $5$ grams.

Can you calculate the corrosion rate of this coupon in mils per year? With this information, can

you say the corrosion rate is acceptable and no concerns should be raised? Explain.