If we

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

Correct answer:

x =  750

Step-by-step explanation:

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

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