To find Rate when Principal Interest and Time are given the rules are.

**Interest = (Principal × Rate × Time)/100Rate = (100 × Interest)/(Principal × Time)**

Principal = $ 3000,

Interest = $ 400,

Time = 3 years.

**Rate = (100 × Interest)/(Principal × Time)**

= (100 × 400)/(3000 × 3)

= 40000/9000

= 4.44 %

Therefore, Rate = 4.44 %.

**2.** Find Rate, when Principal = $ 2100; Interest = $ 350; Time = 2 years.

*Solution:*

Principal = $ 2100,

Interest = $ 350,

Time = 2 years.

**Rate = (100 × Interest)/(Principal × Time)**

= (100 × 350)/(2100 × 2)

= 35000/4200

= 8.33 %

Therefore, Rate = 8.33 %.

**3.** Find Rate, when Principal = $ 10000; Interest = $ 800; Time = 5 years.

*Solution:*

Principal = $ 10000,

Interest = $ 800,

Time = 5 years.

**Rate = (100 × Interest)/(Principal × Time)**

= (100 × 800)/(10000 × 5)

= 80000/50000

= 1.6 %

Therefore, Rate = 1.6 %.

**4.** Richard deposits 5400 and got back an amount of 6000 after 2 years. Find Richard's interest rate.

*Solution:*

Amount deposited by Richard = 5400

He received the amount of money after 2 years = 6000

Simple Interest = 6000 – 5400
= 600

Principal = $ 5400

Interest = $ 600,

Time = 2 years.

**Rate = (100 × Interest)/(Principal × Time)**

= (100 × 600)/(5400 × 2)

= 60000/10800

= 50/9

= 5.555….

= 5.56 %

(Nearest to two decimal place)

Therefore, **Rate = 5.56 %**.

**Word Problems on Simple Interest.**

**In Simple Interest when the Time is given in Months and Days.**

**To find Principal when Time Interest and Rate are given.**

**To find Rate when Principal Interest and Time are given .**

**To find Time when Principal Interest and Rate are given.**

**Worksheet on Factors affecting Interest**

**5th Grade Numbers Page** **5th Grade Math Problems** **From To find Rate when Principal Interest and Time are given to HOME PAGE**

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