[tex]  \huge\mathrm{ \it{Answer࿐}}[/tex]
- Increase = 20 - 15 = 5 points
- [tex] \boxed{ \% \: increase \:  = \frac{5}{15} \times 100  }[/tex]
- [tex] \% \:  \:increase  =  \frac{100}{3} [/tex]
- [tex] \% \:  \:increase  = 33.33[/tex]
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[tex]\mathrm{ \#TeeNForeveR}[/tex]