Toluene is used as a diluent in lacquer formulas. Its vapor pressure at $30\backslash$deg C is $36\mathrm{.}7$ mm Hg absolute If the barometer falls from $780$ mm Hg to $740$ mm Hg$.$ Wil there be any change in the volume of dry air required to evaporate $10$ kg of toluene?

my answer is $5\mathrm{.}4\%$ but textbook answer is $0\mathrm{.}25\%.$

I$\text{'}$d appreciate it if you could tell me which answer is correct.