The length and breadth of a rectangle room is 15cmand12cmrespectively if each of these measurement s is liable to 15% error calculate the error in the perimeter of the room

So the measurements can be off 1.5% in either direction, the answer is simply 3% because the formula for perimeter involves strict multiplication.

Here is the actual proof:

For measurement x, the actual measurement is x + 1.5% of x =

 100% of  x+ 1.5% of x =

   101.5% of x  =  

  1.015x

The other direction likewise can be found by doing 100% - 1.5% = 98.5% = 0.985

So essentially the real measurement is (1 +or- 0.015) * x where x is the measurement.

The length is measured as 15, so the real length is (1 +or- 0.015)*15  

while the width (or breadth) is 12 ( 1 +or- 0.015)*12

Perimeter = 2 * length + 2 * width

  = 2 *  (1 +or- 0.015)*15  + 2 *  12 ( 1 +or- 0.015)*12

\    =   ( 1 +or- 0.015) [ 2 * 15 + 2*12] <--- factors out the error

      =   ( 1 +or- 0.015) * actual perimeter

     = old perimeter +or- 0.015 * actual perimeter

The absolute error is then    1.015 * actual perimeter - 0.985 * actual perimeter = 0.03 * actual perimeter

 which is 3% of the actual perimeter

Explanation:

the berlin blockade was an international crisis that arose from an attempt by the soviet union, in 1948–49, to force the western allied powers (the united states, the united kingdom, and france) to abandon their post-world war ii jurisdictions in west berlin. in march 1948 the allied powers decided to unite their different occupation zones of germany into a single economic unit. in protest, the soviet representative withdrew from the allied control council. coincident with the introduction of a new deutsche mark in west berlin (as throughout west germany), which the soviets regarded as a violation of agreements with the allies, the soviet occupation forces in eastern germany began a blockade of all rail, road, and water communications between berlin and the west. on june 24 the soviets announced that the four-power administration of berlin had ceased and that the allies no longer had any rights there.

anti-semitism hope this !