If we

If we increase the unknown number by 4%, we get 780. Determine the unknown number.

Correct result:

x =  750

Solution:

$$\begin{gathered} q=4\mathrm{\%}=1+{\displaystyle \frac{4}{100}}=1.04 \\ x\cdot q=780 \\ x\cdot 1.04=780 \\ 1.04x=780 \\ x=750 \end{gathered}$$

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