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Simplifying 8720 = 8000(1 + r * 3) Reorder the terms for easier multiplication: 8720 = 8000(1 + 3r) 8720 = (1 * 8000 + 3r * 8000) 8720 = (8000 + 24000r) Solving 8720 = 8000 + 24000r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-24000r' to each side of the equation. 8720 + -24000r = 8000 + 24000r + -24000r Combine like terms: 24000r + -24000r = 0 8720 + -24000r = 8000 + 0 8720 + -24000r = 8000 Add '-8720' to each side of the equation. 8720 + -8720 + -24000r = 8000 + -8720 Combine like terms: 8720 + -8720 = 0 0 + -24000r = 8000 + -8720 -24000r = 8000 + -8720 Combine like terms: 8000 + -8720 = -720 -24000r = -720 Divide each side by '-24000'. r = 0.03 Simplifying r = 0.03
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