Answer
$195,000$
Work Step by Step
$R(10000) - R(5000) = \int^{10000}_{5000} R'(x) dx = \int^{10000}_{5000} (48-0.0012x)dx = [48x - 0.0006x^{2}]^{10000}_{5000}$
$ = 195,000$
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