Class 7 NCERT

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Class 7 NCERT

  • ratio
  • percentage
    • convert percentage into decimal, fraction, vice versa
  • profit and loss
  • simple interest

Class 7 Arjun

Ex 8.1

  • ratio and proportions and their simplest form
  • percentage
  • conversion from percent to fractions and vice versa
  • percent to decimals and vice versa
  • percent to ratios and vice versa
  • of operator?
  • what percent?

Ex 8.2

  • word problems on percent

Ex 8.3

  • profit = sp - cp
  • loss = cp - sp
  • SP and CP
  • profit % = (profit / cp) * 100
  • loss % = (loss / cp) * 100
  • SP = { (100 + profit % ) / 100} * CP
  • SP = { (100 - loss%) / 100} * CP
  • CP = { 100 / (100 - loss%) } * SP
  • CP = { 100 / (100 + profit%)} * SP

Ex 8.4

  • simple interest - when the interest paid every year remains the same
  • SI = (PRT) / 100
  • principal or sum of money (P)
  • time period (T)
  • extra money or interest (I)
  • rate of interest (R) - rate per annum
  • Amount (A) = P + I
  • methods
    • unitary
    • formula
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