Secondary school education and math learning point ( simple and Compound interest)
Simple and compound interest
Every year invest of money that get a extra money it's meaning to the interest.
That keeps to deposit or browed money has invested of bussines it's meaning principal money (Amount)
Interest and principal money . actually said principal money with added it mean principal money. Okay?
Interest-pricipal money= principal money+interest.
Rate of interest
Depending of any fixed deposit and for fix time. That gives money it mean said rate of interest notable 100 tk interest of 1 year it's meaning rate of interest. It said that annual or purchased rate of interest . annual interest rate such as rate 4% or 4 tk in has published on the report.
Classification of interest
*Simply interest
*Compound or circle inty
simple interest
Simply interest give for interest every year .but it didn't added with simple interest so it remains to same.
*Interest (I)=principal money(P)×time(n)×rate of interest (r)
*Meaning(I)=Pnr
*Interest and principal money (A)=principal money(P)+interest(I)
*Meaning A=P+I বা , A=P+Pnr or, A=P(1+nr)
Interest.
1/ 100 tk interest of 1 year 5 tk . 200 tk How much of interest 2 year's?
Example :100 tk 1 year interest 5 tk.
1 " 1 " " 5/100
200 " 2 " " 5×200×2/100
Or, 20 tk.
2/annual rate of interest 10.50 tk 2000 tk how will be interests of 5 year.?
Example : 100 tk 1 year of interest 10.50 tk.
1 " 1 " " 10.50/100
200 " 5 " " 10.50×5×2000/100
Or, 1050 tk.
3/ annual 5% rate 750 How will be interest of 4 year's?
Example: There principal money P = 750 tk. Time n= 4 years r= year 5% interest= I ?
I= Pnr = (750×4×5/100)= 150 tk.
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