Tamil Nadu Board Solutions for Chapter: Life Mathematics, Exercise 14: Exercise 4.5

Sultana bought the following things from a general store. Calculate the total bill amount to be paid by her.

Medicines costing $₹800$ with $\mathrm{GST}$ at $5\%$.

Cosmetics costing $₹650$ with $\mathrm{GST}$ at $12\%$.

Cereals costing $₹900$ with $\mathrm{GST}$ at $0\%$.

Sunglass costing $₹1750$ with $\mathrm{GST}$ at $18\%$.

Air Conditioner costing $₹28500$ with $\mathrm{GST}$GST at $28\%$.

$\mathrm{P}\text{'}\mathrm{s}$ income is $25\%$ more than that of $Q$. By what percentage is $Q\text{'}s$ income less than $P\text{'}s$?

If the numerator of a fraction is increased by $50\%$ and the denominator is decreased by $20\%$, then it becomes $\frac{3}{5}$. Find the original fraction.

Gopi sold a laptop at $12\%$ gain. If it had been sold for $₹1200$ more, the gain would have been $20\%$. If the cost price of the laptop is $₹x$, then find the value of $x$.

A shopkeeper gives two successive discounts on an article whose marked price is $₹180$ and selling price is $₹108$. Find the first discount percentage if the second discount is $25\%$

Find the rate of compound interest at which a principal becomes $1.69$ times itself in $2$ years.

$P$ alone can do $\frac{1}{2}$ of a work in $6$days and $\mathrm{Q}$ alone can do $\frac{2}{3}$ of the same work in $4$ days. In how many days working together, will they finish $\frac{3}{4}$ of the work?

X alone can do a piece of work in $6$ days and Y alone in $8$ days. X and Y undertook the work for $₹4800$. With the help of Z, they completed the work in $3$days. How much is Z's share?