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If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the
If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the
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2015-03-24
30
问题
If an investment of P dollars is made today and the value of the investment doubles every 7 years, what will be the value of the investment, in dollars, 28 years from today?
选项
A、8P
4
B、P
4
C、16P
D、8P
E、4P
答案
C
解析
The investment of P dollars doubles every 7 years. Therefore 7 years from today, the value of the investment will be 2P dollars; 14 years from today, the value of the investment will be 4P dollars; 21 years from today, the value of the investment will be 8P dollars; and 28 years from today, the value of the investment will be 16P dollars. The correct answer is Choice C.
This explanation uses the following strategies.
Strategy 1: Translate from Words to an Arithmetic or Algebraic Representation
Strategy 7: Find a Pattern
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