Answer:
Direct Variation
Step-by-step explanation:
Given: A car travels at a distance of km. The formula that relates
to
is
To find: kind of variation
Solution:
The formula that relates to
is
Here, is a constant of proportionality.
Constant of proportionality is also called as constant of variation.
varies directly as
.
Therefore, this is a direct variation.
The annual rate of interest per year is 8%
<u>Solution:</u>
Given:- Principal (p) = 4600 rupees, Time –Period (t) = 5 years, Total amount(A) = 6440 rupees
First we will calculate the Interest and then using formula of simple interest we will calculate the rate of interest
Interest = Amount – Principal
Interest = 6440 – 4600 = 1840
Now using the formula of simple Interest and on putting values we get,
Where "P" is the principal and "R" is the rate of interest per annum and "T" is the time period
Hence, the required rate of interest per year is 8%