【官方】SAT数学每日一题附答案和解析(2018年2月7日)
- 2018年02月07日09:29 来源:小站整理
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每日一练:数学
Math: Calculator Permitted
Read the following question and then select the best answer.
Three electricity plans are available in a certain county. The monthly usage and corresponding charges for that usage for three households, each using a different plan is shown below. Which plan, if any, has the lowest cost per kilowatt-hour left parenthesis text kWh end text right parenthesis?
|
Plan A |
Plan B |
Plan C |
Kilowatts used |
930 kWh |
900 kWh |
810 kWh |
Monthly charge |
$106.50 |
$110.70 |
$115.20 |
Select an Answer
A.Plan A
B.Plan B
C.Plan C
D.The plans all cost the same amount per kilowatt-hour.
答案及解析:A
EXPLANATION
For Plan A: $ 106.50/ 930 kWh≈$0.11per kWh
For Plan B: $ 110.70/ 900 kWh≈$0.12per kWh