The music for Nadia’s dance routine last for exactly 4 minutes. When Nadia dances her routine, she starts with her music and finishes 12 seconds before the music ends. What percent of the time the music is playing is Nadia dancing?

4 x 60 = 240 seconds

[tex] \frac{12}{60} / \frac{12}{12} = \frac{1}{5} [/tex] of a minute not dancing.

[tex]4 \times 5 = 20 - 1 = 19 [/tex][tex] \frac{19}{20} \times \frac{5}{5} = \frac{95}{100} [/tex]

95% of the time dancing