$$a \propto \frac{1}{b}$$
If $a$ increases by 10%, how would one work out the percentage change of $b$, without knowing the value of either variable?
2026-03-31 05:05:26.1774933526
How to work out percentage change with inverse proportionality?
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Inverse proportion means: $a\cdot b=k$.
Hence: $$1.1a\cdot \frac{1}{1.1}b=k \Rightarrow \frac{1}{1.1}-1=-\frac{1}{11}.$$