Also, note that, 6,250 = 510
C. I. = Interest for (1st + 2nd) quarter
= 250 + 260 = 7510
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12
1
Exercise-7.4
year
1. Rashmi borrowed * 20,000 from a money lender at the rate of 4% per annum for 1-years compounded
1
2
1
half-yearly. Find the amount she has to pay at the end of 1-years.
2
2. Find the compound interest on a sum of 12,000 at the rate of 8% per annum for 1 year compounded
quarterly.
3. Dhani borrowed *18,000 from her friend at the rate of 12% per annum at simple interest. She lent it
further to another friend Aarti at the same rate but compounded annually. Find the profit that Dhani earns
after 2 years.
4. Find the amount and interest on 24,000 for 9 months, being given that interest is compounded quarterly
at the rate of 20 paisa a rupee per annum.
5. What is the compound interest on 7 4,000 for 9 months at 6% p. a, if the interest is calculated quarterly?
?
Mathematics-8 111

Phillip had some bricks. he stacked them in 6 equal piles. which expression shows the number of bricks phillip put in each pile? let the variable m stand for the unknown number of bricks. m + 6 m÷6    m−6    6m

Drag the tiles to the correct boxes to complete the pairs. match the cart-coordinates with their corresponding pairs of y-coordinates of the unit circle

Write the equation of a line that is perpendicular to the given line and that passes through the given point. –3x – 6y = 17; (6, 3) y = x – 9 y = 2x – 9 y = –2x – 9 y = x + 0 3. is the relationship shown by the data linear? if so, model the data with an equation. x y 1 5 5 10 9 15 13 20 the relationship is linear; y – 5 = (x – 1). the relationship is not linear. the relationship is linear; y – 5 = (x – 1). the relationship is linear; y – 1 = (x – 5). write an equation in point-slope form for the line through the given point with the given slope. (–10, –1); m = y + 10 = (x + 1) y – 1 = (x – 10) y – 1 = (x + 10) y + 1 = (x + 10) 5. write an equation for each translation of . 6.5 units up y + 6.5 = | x | y = | 6.5 x | y = | x | + 6.5 y = | x | – 6.5 6. write an equation for each translation of . 5.5 units right y = | x | + 5.5 y = | x – 5.5 | y = | x | – 5.5 y = | x + 5.5 | 7. which equation translates y = | x | by 8 units to the left? y = | x | – 8 y = | x | + 8 y = | x – 8| y = | x + 8|