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The "I Love You" Tree

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Puzzle ID:#568
Fun:*** (2.7)
Difficulty:* (1.08)
Submitted By:Squidgy***
Corrected By:sdm1177




When Mike and Milly were first going out, they carved their initials inside a heart on a tree trunk 3 feet off the ground. Exactly one year later, they married. The tree had grown 8 inches over the last year. During the following years it doubled its growth rate annually. How high was the heart on their tenth anniversary?

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