commercial bank of ethiopia has 10000 loyal customwer takn personal loan the bank feels that there has been an increse to the number of defaulters. the bank would like to know whether people who are regular (no default) and defaulters differ in terms of characteristics such as age, sex, occupation, and marital status. for this scenario which type of research you recommand as the most sutable type of research ( explanatory, descriptive, exprmentation, and longitudinal). explain the reasonsfor your choice?

Wo firms, a and b, each currently dump 50 tons of chemicals into the local river. the government has decided to reduce the pollution and from now on will require a pollution permit for each ton of pollution dumped into the river. it costs firm a $100 for each ton of pollution that it eliminates before it reaches the river, and it costs firm b $50 for each ton of pollution that it eliminates before it reaches the river. the government gives each firm 20 pollution permits. government officials are not sure whether to allow the firms to buy or sell the pollution permits to each other. what is the total cost of reducing pollution if firms are not allowed to buy and sell pollution permits from each other? what is the total cost of reducing pollution if the firms are allowed to buy and sell permits from each other? a. $3,000; $1,500 b. $4,500; $3,500 c. $4,500; $4,000 d. $4,500; $2,500