Which of the following is correct formula to calculate IQ?

The universally established quantitative index for human intelligence scoring is the Intelligence Quotient ($\text{IQ}$) formula formalized by Lewis Terman.The mathematical ratio relates an individual's tested Mental Age ($\text{MA}$) to their actual biological Chronological Age ($\text{CA}$), scaled by a factor of $100$ to eliminate decimals:
$$\text{IQ}=\frac{\text{MA}}{\text{CA}}\times 100$$