Answer:
it increased with a percentage of 43 percent
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[tex]Let \: Sale \: in \: 2010 \: =100[/tex]
[tex]let \: sale \: in \: \: 2011 = \: 80[/tex]
[tex]Required \: Increase \: = \frac{100 - 20}{20} \times 100[/tex]
[tex] = \frac{80}{20} \times 100[/tex]
[tex] = \frac{8000}{20} [/tex]
[tex] = 400\%[/tex]
Answer:
it increased with a percentage of 43 percent