First, you would determine how much more this new weekly payment is. As we are getting a raise of .06 times our old payment, our new payment will be (old payment)+(.06*(old payment)), or more simply, 1.06 times the old payment. Multiplying this out gives us 1.06*250, or 265
Another way to do this, which is also two steps, is to multiply the old payment by .06 then add that to our old payment.
.06*250 = 15
250+15 = 265
I hope this helps!