4. If the worker contemplated in section 2 obtains new employment, whether or not it is mentioned in paragraph b of section 1, the complementary indemnity shall be reduced by an amount equivalent to 50% of the disposable net income from such new employment not exceeding $5 000 or, if such income exceeds $5 000, equivalent to 50% of the first $5 000 and 75% of the remainder.