Please work out this problem in a simple

The CaCO3 in a 0.2711g portion of an antacid tablet was dissolved. Followingprecipitation of Ca2+ by C2O42- through gravimetric analysis and drying overnight,131.8mg of CaC2O4. Calculate the mass of CaCO3 in the sample.mCaCO3 = ___________________ mg CaCO3