How to remember multiplication
1 answer:
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The amount of interest he would earn in one (1) year is equal to $80.
<u>Given the following data:</u>
- Interest rate = 10% = 0.1
- Principal = $800
- Time = 1 year
To determine how much interest he would earn in one (1) year:
<h3>How to calculate simple interest</h3>Mathematically, simple interest is given by this formula:
<u>Where:</u>
- S.I is the simple interest.
- P is the principal or starting amount.
- R is the interest rate.
- T is the time measured in years.
Substituting the given parameters into the formula, we have;
Simple interest = $80
Read more on simple interest here: brainly.com/question/24341207
Answer:
3.08 km/h.
Step-by-step explanation:
We know that,
Ali traveled at a speed of s km/h for 2.5 hours.
Let d be the distance and t be the time.
...(1)
On his return journey, he increased his speed by 4 km/h and saved 15 minutes. So, distance is d and times is t-15.
...(2)
From (1) and (2), we get
Put t=40 in (1).
So, t=40 and d=100.
Now,
Total distance = d + d = 100 + 100 = 200
Total time = t + t - 15 = 40 + 40 - 15 = 65
So, the average speed is
Therefore, the average speed is 3.08 km/h.