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.
Gas-Powered Pressure Washers. In contrast, gas washers can deliver more than 3,000 psi and are good for cleaning siding, decks and concrete. They can be rented and bought and have accessories added onto them like chemical injectors and longer spray wands. Its estimated they cost anywhere from $300 to $800.