Simple compound interest

Simple compound interestSecondary school education and math learning point ( simple and Compound interest)

1) annual purchase 5.00 rate of interest How many time of interest 300 tk.  সমand 300  profits 405 tk.

Example : interest =interest and profits -p  ,so interest = ( 405-300) = 105 tk
100 tk 5 interest 1 year.
1     "  1   "   "  1×100/5
300 "  105   "  1×100×105/5×300 =7 year .
Answer: 7 year.
2) 6,666 annual 10% interest How many will be 23332 tk?
Example: interest = interest p  - profits
 so= (13332-6666) = 6666 tk
10% interest , 100 tk 1 year interest 10 tk
1   "   "  1  " 10/100
6666"    1  "  10×6666/100 = 666.6 tk
Answer: 666.6 tk.
3) 8,888 annual 10% interest How many years Will be interest and profits 17,776 tk?
Example: interest= ip  - p so interest = (17,776-8888) = 8888 টাকা
10% 100 tk 1 year of interest 10 tk.
1   "   1   "   10/100
8888 "  1  "  10×8888/100 = বা 888.8 টাকা
নির্ণয়ে সময় 8888/888.8 = 10 বছর
Answer: 10 years.
4) annual 8% rate of interest How many years Will be interest and profits? 
Example: p 100 tk  interest  100 tk.
Time = 100/8 year = 12 .5
Answer: 12.5
5) annual 5 rate of interest.how many years Will be interest more than profits? 
Example: p 100 tk it will be interest and profits (100×2) = 200 tk.
Interest = (200-100) = 100 tk.
Time 100/10 years = 10 years
Answer:10 year.
6) annual 10 tk rate of interest.how many years Will be profits more than interest? 
Example: profits 100 tk it will be interest and profits =(100×3)= 300 tk.
Interest= (300-100)= 200 tk.
Time = 200/10 yeari= 20 year.
Answer:20 year.

                            

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