From the information in the problem, the ratio of defective cameras to cameras shipped is

. Reducing this ratio, we get the simplified form of

which, incidentally, gives us our answer. We have
1 defective camera for every 200 cameras shipped.
X = - 8 should be the answer
If
varies directly as
, then there is some constant
for which

Similarly, there is some constant
such that

Given that
when
, we have

Now when
, we get

Answer:
$55.20
Step-by-step explanation:
Create a proportion where x is the cost of 12 lbs of walnuts:
= 
Cross multiply and solve for x:
0.75x = 41.4
x = 55.2
So, for 12 lbs of walnuts, it will cost $55.20
$1.98 divided by 2 is $0.99
So the sale price is $0.99