Calculate the atomic mass of element "X", if it has 2 naturally occurring isotopes with the following masses and natural abundances:
X-45 44.8776 amu 32.88%
X-47 46.9443 amu 67.12%
a. 46.26 amu
b. 46.84 amu
c. 45.91 amu
d. 44.99 amu
e. 46.34 amu
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