hooking up amps and speakers?

does hooking speakers to an amp in the "parallel setup" give full power to each speaker. say i have 4 speakers and a 100 watt 1channel amp. if i hook all 4 speakers in parallel to the single channel wwould it give 100 watts to each speaker? or 25 to each? less?

if i hooked 4 speakers to a 100 watt 4 channel amp.1 speaker per channel. would it give 100 watts per speaker or 25 or less?

if i hooked 4 speakers to a 200 watt 2 channel amp. 2 speakers in parallel per channel, would it give 100 watts per speaker, or less or what?

or do i need to use "series setup"

basically why im asking is, i have four of these http://www.sonicelectronix.com/item_10629_Boss-MR6... i took out of a truck i bought and sold. i wanna hook all four of them 2 one amp and use this cheap head unit to put music to them on my rzr and i need an amp. i dont wanna spend a bunch of money i just need to know how many watts and channels i need.