 # RD Sharma Solutions Class 7 Mathematics Solutions for Simple Interest Exercise 13.1 in Chapter 13 - Simple Interest

A man borrowed Rs 8000 from a bank at 8% per annum. Find the amount he hasto pay after 4 ½ years.

Given Principal amount P = Rs 8000

Time period T = 4 ½ years = 9/2 years

Rate of interest R = 8% p.a.

We know that simple interest = (P × T × R)/100

On substituting these values in above equation we get

SI = (8000 × (9/2) × 8)/100

= Rs 2880

Amount = Principal amount + Interest

= Rs 8000 + 2880

= Rs 10880

Video transcript
hello friends this is neha and i welcome you to lido's online homework calling session today we'll be looking at the following question the questions is an atom of an element is denoted by a symbol explain the meaning of the term symbol so first in this question we need to explain the meaning of the term symbol state a reason for representing the following elements by their symbols hydrogen by h helium by e and copper by c now let's first start this question by answering the first part that is explain the meaning of the term symbol symbol is basically the short form or we also call is as abbreviated name of an element this is what we call it as symbol which is a short form of abbreviated name of an element is a symbol of an element now state a reason for representing the following elements by the symbol that is the first one it is asking hydrogen it is asking why is hydrogen represented by capital h now as i look at the spelling of hydrogen it starts with h so as the first letter of an element starts with h it is represented by h as the first letter of the element hydrogen starts with h so that is why the symbol for hydrogen is h b helium it is represented by capital h and small e why because the first two letters of the name of the noble gas has this as it at its start that is helium the first two letters are hg let's look at the second third part copper copper it is represented by capital c and u now this is derived its symbol from its latin name and that is why it is represented by cu so friends this is how we approach this question hope you understood the solution in case if you have any doubts please drop a comment below subscribe to this channel for regular updates thank you
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