As per the International Civil Aviation Organization (ICAO), the basic runway length is increased by $x(\%)$ for every $y(\mathrm{~m})$ raise in elevation from the Mean Sea Level (MSL). The values of $x$ and $y$, respectively, are
- $7 \%$ and $300 \mathrm{~m}$
- $5 \%$ and $200 \mathrm{~m}$
- $4 \%$ and $500 \mathrm{~m}$
- $10 \%$ and $1000 \mathrm{~m}$