1. Mr. Smith deposited $40,000 in a bank and earned simple interest at 7% per annum for two years. Calculate the interest earned at the end of the period.
Discuss
A. $ 4000
B. $2800
C. $5600
D. $3400
E. $200
2. How much simple interest is due on a loan of US$120 for two years if the annual rate of interest is 5%
A. $12
B. $13.20
C. $26.40
D. $26
E. $33
3. A man wishes to invest $1500. He can invest in ulintplus Investment club which pays simple
interest of 8%for 3 years. What is the amount in his account after 3 years
A. $18321
B. $1860
C. $1830
D. $1524
E. $5024

1. 5600

2.B

3.B

Step-by-step explanation:

the largest number of the four options is 1.8 x 10-2

you have it in scientific notation.

1.80 x 10-6   = 0.00000180

1.80 x 10-4   = 0.000180 (bigger, or "less small", than the former one)

so

1.8 x 10-2       = 0.0180. as you see. the "less small", or the biggest one of them all.

as you have negative exponent, it means you are dividing 1.8 by 100 (i.e. moving the dot towards left, two times).

if you had positive exponent for the scientific notation, power of tenths, you would be multiplying times 100 (moving the dot towards right) as below:

1.8 x (10)2 = 180

so. if you have negative exponent in scientific notation, move the dot toward left. if it is positive, toward right as many times the exponent tells you.