A 10% deposit sounds fine until tax takes a slice and inflation takes the rest. This shows the return in purchasing power, and the rate you'd need just to break even.
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Real return uses the exact Fisher relation, (1 + after-tax) ÷ (1 + inflation) − 1, not the subtraction shortcut. Tax is applied to the return each year, inflation is assumed constant.
These tools are provided as they are, for working things out. They are not part of Aether's audited model engine and their results are not checked against it. Satisfy yourself that a number is right before you rely on it.