Thus, a genotype's frequency will decline or increase depending on whether its fitness is lower or greater than the mean fitness, respectively. In the particular case that there are only two genotypes of interest (e.g. representing the invasion of a new mutant allele), the change in genotype frequencies is often written in a different form.
1 Places such as Lowes and Home Depot will charge around $60 per day. 2  According to DoItYourself.com, they claim that average daily rental is going to be around $60 per day. 3  They also note that a good pressure washer should cost you around $350. 4  SunbeltRentals.com offers a variety of pressure washers.
Cost breakdown. Labor: armed with an arsenal of safe, fuel emission solvents to remove the oil stains and black haze, professional pressure washers are ideal for pressure washing a driveway. Professional pressure washing will cost between $60-$100 per hr. An area of less than 100 sq.ft. will take about 1 hour for a total cost of between $60-$100. Equipment rental: pressure washing a driveway is possible to do as a DIY style project. Rent a pressure washer from most hardware stores like Home Depot and Lowes with a $100-$150 deposit for $76-$99 per day.