Can u pls answer these questions pls

1.$200 at 4.5% for 8 years
2.%450 at 4% for 1/2 year
3.$2 at 9.6% for 8 months
4.$400 at 3% for 1 month

This is a simple interest problem, the formula is 

A = P(1 + rt) P = principal, r = rate, t = time

1.) $200 at 4.5% for 8 years

A = 200(1 + (.045 * 8))
= 200(1.36)
= $272

2.)$450 at 4% for 1/2 year (.5 year)

A = 450(1 + (.04 * .5))
= 450(1.02)
= $459

3.) $20,000 at 9.6% for 8 months (.67 years)

A = 20,000(1 + (.096 * .67))
= 20,000(1.06432)
= $21,286.40

4.) $400 at 3% for 1 month (.08 years)

A = 400(1 + (.03 * .08))
= 400(1.0024)
= $400.96

He spend on cheese is $23.63.

Step-by-step explanation:

Given:

Chan Hee bought 3.4 pounds of cheese that  cost $6.95 per pound.

Now, to find the amount he spend on cheese.

As given the unit rate:

Cost of per pound of cheese = $6.95.

So, to get the amount Chan Hee spend on buying cheese we multiply the number of pounds of cheese to the cost of per pound of cheese.

Therefore, he spend on cheese is $23.63.