13At the start of an experiment there are 20000 bacteria. The number of bacteria increases at a rate of 30% per hour. (a) Work out the number of bacteria after 4 hours.

(b) After how many whole hours, from the start of the experiment, will the number of bacteria be greater than one million?

60 for the first and 130 for the second

step-by-step explanation:

change of stock price/initial stock price on friday * total stock value = change of stock value

0.89/73.73 *x = 42.72

x=3539.04 = total stock value at initial stock price on friday .

total stock value at initial stock price on friday/ initial stock price on friday = number of shares

3539.04/73.73 = 48 shares

they own 48 shares of this stock