Basically I've been offered part of someone else's role on top of mine to help save the company money and prevent another employee being hired. This work would be the equivalent of about a day extra a week on top of my current role, interspersed within my workload (so it's not entirely cut and dried as a separate role).
When first discussing this, my manager said I wouldn't get "extra" money for taking up this offer but I would be up for a "pay rise". As this would be approx. 20% extra work, should I go for and try and negotiate a 20% pay rise?
Normally pay rises in the company are only in the region of about 4%. I got the impression this is what my manager meant but it wouldn't be worth taking up the new role if I was only going to get a few pounds extra a month.
WWYD?