A man bought 150 magazines for 450$, he sold the half of them at a profit of 20% , 50 of the magazines at a profit of 10% and the rest at a loss of 4% a) how much did he receive from the sales.?

How do you find p(a and b) if a and b are independent events for two or more actions, such as tossing a coin twice and finding p(heads and heads)? 2. how do you find p(a or b) if a and b are independent events for one action, such as spinning a four-color spinner once and finding p(red or blue)?