# Chapter 1 - Problem Solving and Critical Thinking - 1.2 Estimation, Graphs, and Mathematical Models - Exercise Set 1.2: 35

estimated = 42 rounding off = 42.03

#### Work Step by Step

After rounding off the estimate is simplified as $\frac{0.2 * 105}{0.5}$ = 42 The actual calculation is $\frac{0.19996 * 107}{0.509}$ = 42.03

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