The cost per unit of electricity during a 4 year period is as follows:
Year 1, $0.5 per unit;
Year 2, $1.0 per unit;
Year 3, $1.5 per unit;
Year 4, $2 per unit.
If a factory spent equal dollars on electricity each year, what was the average cost of a unit of electricity during the 4 year period?  Choose the correct choice from the following answers:
A) $1.96
B) $0.96
C) $1.56
D) $1.46
E) $1.36
Let money spent each year = $6   Units bought first year = 12   Units bought second year = 6   Units bought third year = 4   Units bought fourth year = 3   Total number of units = 25   Total money spent = 6*4= 
<gadget id="calculator">6*4</gadget>
<output>24</output>
24   Average= 24/25= 
<gadget id="calculator">24/25</gadget>
<output>24/25 = around 0.96</output>
0.96   Answer : $0.96
<result>B</result>
The cost per unit of electricity during a 4 year period is as follows:
Year 1, $0.5 per unit;
Year 2, $1.0 per unit;
Year 3, $1.5 per unit;
Year 4, $2 per unit.
If a factory spent equal dollars on electricity each year, what was the average cost of a unit of electricity during the 4 year period?