I add awl them up or subtract which one i have to do that the one wiil do

There are
of each suit in a deck of
cards.
This means the probability of drawing a diamond card is
. You can divide the numerator and denominator each by
to simplify. 
Since there are the same number of clubs as there are diamonds, the probabilities are the same.
The company should expect 235 in sales
plug in 50 for x, 2.1 times 50 is 105, 105 + 130 is 235, y = 35.
After 40% discount, it is selling at 60%
60% = 3.00
1% = 0.05
100% = 0.05 x 100 = $5.00
original price = $5.00