A price of 40 pounds is increased by 50% and then reduced by 20%. What is the final price?

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If a train traveling at $72 km/h$ takes $15 seconds$ to pass a signal pole completely, what is the length of the train?
A regular polygon has an exterior angle measuring $2 4^{\circ}$ . How many sides does this polygon have?
If $x + \frac{1}{x} = 5$ , what is the numerical value of $x^{2} + \frac{1}{x ^{2}}$ ?
A water tank can be filled by Pipe A in 6 hours and by Pipe B in 12 hours. If both pipes are opened simultaneously, how long will it take to…
In a right triangle, the hypotenuse is $25 cm$ and one leg is $7 cm$ . What is the area of the triangle?
What is the sum of all positive integers from 1 to 100 inclusive?