To prevent a $150\text{ kg}$ iron safety gate from rusting, it undergoes galvanization where a protective…
To prevent a $150\text{ kg}$ iron safety gate from rusting, it undergoes galvanization where a protective zinc layer equal to $2\%$ of the iron's mass is coated onto it. What is the total mass of the gate after galvanization?
$152\text{ kg}$
$153\text{ kg}$
$150.2\text{ kg}$
$180\text{ kg}$
Solution
The mass of the added zinc layer is $2\%$ of $150\text{ kg} = 3\text{ kg}$. Thus, the final mass of the galvanized gate is $150 + 3 = 153\text{ kg}$.