Simple interest over several years

Difficulty Stretch · Set 20dyxz

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1
2000 is invested at 3% simple interest for 4 years. How much interest is earned?
2
12100 is invested at 9% simple interest for 4 years. How much interest is earned?
3
1900 is invested at 12% simple interest for 6 years. How much interest is earned?
4
12900 is invested at 3% simple interest for 6 years. How much interest is earned?
5
14700 is invested at 7% simple interest for 2 years. How much interest is earned?
6
8000 is invested at 7% simple interest for 4 years. How much interest is earned?
7
16600 is invested at 12% simple interest for 6 years. How much interest is earned?
8
6000 is invested at 3% simple interest for 3 years. How much interest is earned?
9
2600 is invested at 3% simple interest for 4 years. How much interest is earned?
10
19200 is invested at 7% simple interest for 2 years. How much interest is earned?
11
10000 is invested at 7% simple interest for 2 years. How much interest is earned?
12
1300 is invested at 7% simple interest for 3 years. How much interest is earned?
13
18800 is invested at 7% simple interest for 2 years. How much interest is earned?
14
7300 is invested at 7% simple interest for 4 years. How much interest is earned?
15
12900 is invested at 12% simple interest for 5 years. How much interest is earned?
16
4400 is invested at 11% simple interest for 3 years. How much interest is earned?
17
7800 is invested at 11% simple interest for 5 years. How much interest is earned?
18
9300 is invested at 11% simple interest for 6 years. How much interest is earned?
19
19900 is invested at 11% simple interest for 6 years. How much interest is earned?
20
10400 is invested at 11% simple interest for 2 years. How much interest is earned?

What is in this set

The numbers in this set run from 2 to 20,000.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: that is the total at the end; the question asks for the interest on its own.
Answers are a whole number.

Drawing 240 problems from this page produced 234 different ones, 98% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 8 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.