The average of the marks of 30 students in a class is 45. If the marks of each student are doubled, find the new average?	Select:
A) 85
B) 77
C) 33
D) 90
E) 75
Sum of the marks for the 30 students   = 30 * 45= 
<gadget id="calculator">30 * 45</gadget>
<output>1_350</output>
1350. The marks of each student are doubled, the sum also will be doubled.   The new sum= 1350 * 2= 
<gadget id="calculator">1350 * 2</gadget>
<output>2_700</output>
2700. So, the new average= 2700/30= 
<gadget id="calculator">2700/30</gadget>
<output>90</output>
90.   Answer:90
<result>D</result>
The average of the marks of 30 students in a class is 45. If the marks of each student are doubled, find the new average?