Value of stock of goods is = $27000
Cost of insurance for $100 is = $1.85
So we can find cost of insurance for $1 by dividing 1.85 from 100.
So cost on insurance for $1 =

Now we can find cost of stock of good by multiplying total stock of good from cost of insurance of $1.
So cost of insurance is =

So required answer is = $499.5