Installing tenants washer an dryer they bought

[Benjamin Lenno]

My tenants bought a washer an dryer an asked me to help them install the washer drain an dryer vent. I went over this morning it took maybe 2 hours including a trip up to handyman. It cost me about $12 bucks in materials. Is this something you would charge for ? Or just chalk it up as helping the tenants out. They are a older couple on disability. Just wondering.