If 2a = 4b = 10, then 40ab = Select the correct option: A) 50 B) 100 C) 250 D) 450 E) 500
2a * 4b = 10 * 10= 
<gadget id="calculator">10 * 10</gadget>
<output>100</output>
100   8 ab= 100   i.e. 40 ab = 500   Answer: Option 500
<result>E</result>
If 2a = 4b = 10, then 40ab =