I know the answer has to be close to 265 but i need the exact amswer please asap

A magnesium alloy, K1c=15.6MPam1/ is used to make a structural component for a racing vehicle. For safety, each component is inspected using an x-ray technique that can find any flaw larger than 2.4mm. On the assumption that a 2.4mm flaw is present, what is the maximum tensile stress that the component can support without failing? (Assume Y=1.1 ) MPa