40
Total marks obtained by 100 students = 100 x 85 = 8,500
Total marks obtained by 90 students = 90 x 90 = 8,100
Marks of= 100 — 90 =10
Students = 8,500 — 8,100 = 400
Average obtained by 10 students = $\frac{400}{10}$= 40.
TK 7450
The cost of 200 shares = 175 x 200 = Tk. 35000
Total dividend = 200 x 2.25 = Tk. 450
No. of bonus share = $\frac{200}{5}$ = 40
The cost of bonus = 40 x 175 = Tk. 7000
TK 18200Q
If he buys a house his expenditure per year = 1,750,000 x 0.08 + 22,200
= 1,62,200
If he rents, has expenditure per year = 12,000 x 12 = 1,44,000
Renting option is preferable by = 162200 – 144000 = 18,200
TK $\frac{40}{3}$
In 100 Tk, the price of petrol reduced = TK 40
So, Present Price of 5 liter petrol = 40 TK
So, Present Price of 5 liter petrol =$\frac{40}{5}$= 8 TK
Again, at 40% reduction, price of petrol = 100-40 = TK 60
As present price TK 60, former price was = 100 TK
As present price TK 8, former price was = $\frac{100\cdot8}{60}$ TK = TK $\frac{40}{3}$
500 miles
AB² = AC² + BC² (applying Pythagoras)
= (100+200)² + (700-300)² = 250000
Here, AB² = 500²
So, AB = 500 miles
