Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
![5. How m
bank calculates 9% simple interest ?
6 Hew long will Rs. 3,000 take to amount to Rs. 3,300 at 4% simple interest ?[Ans.
[Ans. Rs. 19,560]
2.5 years]
- Bam borrowed Rs. 5,000 from Shyam at 8% simple interest. After 9 months again he
borrowed Rs. 2,000, promising to return the entire indebtedness at the end of two
years. What amount Shyam will get from Ram ?
8 Suresh borrowed Rs. 830 from Vikas at 12% rate of interest for 3 years. He then
added some more money to the borrowed sum and lend it to Deepak for the same
time at 14% simple interest. If Suresh gains Rs. 93.90 in the whole transaction, find
the sum lent by him to Deepak.
[Ans. Rs. 8,000]
[Ans. 935]
9. A certain amount of money was invested at 8% simple interest and after 9 months
an equal amount was invested at 10% simple interest. Find the period in which the
amount in each case becomes Rs. 52,000. How much money was invested in each
[Ans. 3 yrs. , Rs. 40,000]
ment
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