"It took all of 35 minutes and $90.00 in material."

It took more than 35 minutes.
You had time on the phone.
The trip out to give the estimate.
Gas for two trips. Wear & Tear on your truck.
Pro-rated- The cost of your tools. The time spent putting gas in your truck. Phone bill.
Insurance. Office supplies. Giving quotes for jobs you didn't get, etc etc etc
And don't forget Uncle Sam.

I wouldn't say it was too much or too little.
It all depends on your situation. If you haven't determined your total cost of operating you may not know if it is too little until it's too late.

I gave up on the psychology aspect of pricing
long ago. It seems every time I was actually trying to give someone a good deal they thought I was ripping them off, but If I pushed the limits on pricing I was their Hero.
Go figure.
Go figure.