Purification & Characterisation · Carbon hydrogen estimation

0.25 g of an organic compound “A” containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of $\ce{CaCl2}$ tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is %. (Nearest integer)

(Given : molar mass in g mol$^{-1}$ H : 1, C : 12, O : 16)