<prompt> Translate the following text to SwahiliIn order for the discount to remain unchanged when Pb is changed, the price of the workshare category must be changed in an amount exactly equal to gDPb, as made clear by Equation 4.  <response>: Ili discount kubaki unchanged wakati Pb ni kubadilishwa, bei ya jamii ya kazi-share lazima kubadilishwa katika kiasi sawa na gdpb, kama ilivyoelezwa wazi na equation. 