I started to mow this guys yard for $30 a cut. One of my first accounts. His yard is very small and flat in front and 1/4 acre backyard on severe slope. I only have 60" ZTR and push mower. 60" ZTR wont fit through the gate, so I have to push mow and it takes 30 min. It would not take long if i had walk-behind. Should i raise rate, and how much. How should i explain to customer. Your opinions please!