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We will determine the percent markup as follows:
[tex]776-465=311[/tex]They increased by $311, now we determine the percentage that 311 represents:
[tex]x=\frac{311\cdot100}{465}\Rightarrow x=\frac{6220}{93}\Rightarrow x\approx66.9[/tex]From this, we have that the percent markup was about 66.9%.