Given:
Principal value = $12000
Rate of interest = 2.5%
To find:
Total amount after 15 years.
Solution:
Formula for amount discontinuously compounded interest is

where, P is principal, r is rate of interest and t is time in years.
Substitute P=12000, r=0.025 and t=15 in the above formula.





Therefore, the amount after 15 years is $17459.897.
If a is directly proportional to b, we have the relationship to be:

When a = 25, b = 35. Therefore, we can calculate the value of k as follows:

Therefore, the relationship is given to be:

When a = 40, we can calculate the value of b to be:

The value of b is 56.
Answer:
a(b+c)= ab + ac
Step-by-step explanation: