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Answer:
2010
Step-by-step explanation:
N(t) = 113(0.973)^t
N(t) = 50
=> 113(0.973)^t = 50
0.973^t = 50/113
= 0.44
t = ^0.973 Log 0.44 = 30
the year = 1980 + 30 = 2010