JEE Main 2020 Physics question

A bakelite beaker has volume capacity of 500 cc at 30ºC. When it is partially filled with volume (at 30ºC) of mercury, it is found that the unfilled volume of the beaker remains constant as temperature is varied. If ºC⁻¹ and ºC⁻¹, where is the coefficient of volume expansion, then (in cc) is close to .