How many positive even integers less than 100 contain digits 5 or 7?	Choose the correct choice from the following answers.
A) 10
B) 17
C) 18
D) 19
E) 20
Two digit numbers:   5 at tens place: 50,52,54,56,58   7 at tens place: 70,72,74,76,78   If 5 and 7 is at units place, the number cant be even   Total:5+5= 
<gadget id="calculator">5+5</gadget>
<output>10</output>
10   10nswer 10
<result>A</result>
How many positive even integers less than 100 contain digits 5 or 7?