Mathematics: 12. Uche bought two books at A125 each. She was given A1,000 note. What will be - her balanceamount?A. N75 B. N100 C. N250D. N750 E. 1000

12. Uche bought two books at A125 each. She was given

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25.07.2022

Option B. $0.84

Step-by-step explanation:

As we know the formula of Consumer Price Index.

$C.P.I.=\frac{P_{1}}{P}\times 100$

Here $p_{1}$ is Current price of the the product.

P = Price of the product in the base year

Now we will plug in the values for year 1970

$38.8=\frac{0.25}{p}\times 100$ ------------(1)

Similarly for the year 1990.

$130.7=\frac{p_{1} }{p}\times 100$ ---------(2)

Now we will divide equation 2 from 1.

$\frac{130.7}{38.8}=\frac{p_{1}}{0.25}$

$P_{1}=\frac{(130.7)(0.25)}{38.8}=0.84$

Therefore, The price of a jar of grape jelly would be $0.84 in 1990.

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