Calculation of Atomic Mass with Isotopes

In atomic physics, the concept of atomic mass is crucial in understanding the properties of elements. Atomic mass is generally defined as the weighted average mass of the isotopes of an element, measured in atomic mass units (amu). Isotopes of an element have the same number of protons but differ in the number of neutrons, which affects their atomic mass.

Consider an element with two stable isotopes: Isotope A has a mass of 10 amu and makes up 75% of the element, while Isotope B has a mass of 12 amu and constitutes 25% of the element. What is the atomic mass of this element?