An investor wants to determine how much interest he must earn to be able to make the payments on a 10-year mortgage which has increasing annual payments. The problem is summarized in the accompanying spreadsheet. The investor has enough money to make an initial investment of $12,000 and hopes he can earn 18% on his investments. He would like to know how low his annual return can be and still allow him to make his payments from interest income.
What formulas should go in cells B7:F7 of the spreadsheet for this problem? 
Definitions:
Traditional Mental Set
A fixed way of thinking about objects and activities.
Idea Quota
A predetermined number of ideas or creative outputs that an individual or team aims to produce within a specific timeframe.
Enhancing Creativity
The process of fostering an environment or using techniques that encourage the generation of new and innovative ideas or solutions.
Environmental Conditions
The various physical and biological factors that compose the surroundings in which an organism operates.
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