A bookshop had science and art books in the ratio of 2:5. By the end of the week, 20% of both type of books were sold and 2240 books were unsold. How many art books were there at the starting?  Choose the correct choice from the following options:
A) 1000	B) 1200	C) 1500	D) 1600	E) 2000
science books sold = 2x × 0.2 = 0.4x   science books unsold = 2x – 0.4x = 1.6x   art books sold = 5x × 0.2 = x   art books unsold = 5x – x = 4x   total books unsold = 1.6x + 4x = 5.6x   5.6x 1.6  + 4= 
<gadget id="calculator">1.6  + 4</gadget>
<output>5.6</output>
5.6x   5.6x= 2240   x = 400   2x science = 800   and 5x art books = 2000   2000
<result>E</result>
A bookshop had science and art books in the ratio of 2:5. By the end of the week, 20% of both type of books were sold and 2240 books were unsold. How many art books were there at the starting?