At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and was charged $ 2.25. Stella ordered 2 doughnuts and a cup of coffee and was charged $ 1.80. What is the price of 2 doughnuts?	Choose the most appropriate option
A) $ 0.55
B) $ 1.00
C) $ 1.10
D) $ 0.90
E) $ 1.80
3$ 0.90 + C = 2.25......(1)   2$ 0.90 + C = 1.8........(2)   (1) - (2) --&gt; $ 0.90 = 0.45 --&gt; 2$ 0.90 = 0.9   Answer: $ 0.90
<result>D</result>
At a certain diner, Joe ordered 3 doughnuts and a cup of coffee and was charged $ 2.25. Stella ordered 2 doughnuts and a cup of coffee and was charged $ 1.80. What is the price of 2 doughnuts?