Which is a better deal? Sabrina wants to buy a new digital camera. The one she wants is currently on sale for $$300$. She could borrow the money at a monthly interest rate of $4\%$ simple interest and pay it off after $6$ months. Her other option is to work for 6 months and then pay cash, but the camera will no longer be on sale and will cost $$350$.

Which option will cost her the least money? Include calculations to justify your advice.