Featured Original PDF
Featured Original PDF
BANKER’S DISCOUNT IMPORTANT CONCEPTS Banker’s Discount : Suppose a merchant A buys goods worth, say Rs. 10,000 from another merchant B at a credit of say 5 months. Then, B prepares a bill, called the bill of exchange. A signs this bill and allows B to withdraw the amount from his bank account after exactly […]
COMPOUND INTEREST Compound Interest: Sometimes it so happens that the borrower and the lender agree to fix up a certain unit of time, say yearly or half-yearly or quarterly to settle the previous account. In such cases, the amount after first unit of time becomes the principal for the second unit,the amount after second […]
BOATS AND STREAMS IMPORTANT FACTS AND FORMULAE 1.In water ,the direction along the stream is called downstream and ,the direction against the stream is called upstream. 2.If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr,then: speed downstream=(u+v)km/hr. speed upstream=(u-v)km/hr. 3.If the […]
PIPES AND CISTERNS IMPORTANT FACTS AND FORMULAE Inlet: A pipe connected with a tank or a cistern or a reservoir, that fills it, is known as an inlet. Outlet: A pipe connected with a tank or a cistern or a reservoir, emptying it, is known as an outlet. (i) If a pipe can fill a […]
CHAIN RULE _IMPORTANT FACTS AND FORMULAE Direct Proportion: Two quantities are said to be directly proportional, if on the increase (or decrease) of the one, the other increases (or decreases) to the same Ex. 1. Cost is directly proportional to the number of articles. (More Articles, More Cost) Ex. 2. Work done is directly […]
TRUE DISCOUNT IMPORTANT CONCEPTS Suppose a man has to pay Rs. 156 after 4 years and the rate of interest is 14% per annum. Clearly, Rs. 100 at 14% will amount to Rs. 156 in 4 years. So, the payment of Rs. 100 now will clear off the debt of Rs. 156 due 4 years […]
VOLUME AND SURFACE AREA IMPORTANT FORMULAE I. CUBOID Let length = 1, breadth = b and height = h units. Then, 1. Volume = (1 x b x h) cubic units. Surface area= 2(lb + bh + lh) sq.units. Diagonal.=Öl2 +b2 +h2 units II. CUBE Let each edge of a cube be of length a. […]
TIME AND WORK II MPORTANT FACTS AND FORMULAE If A can do a piece of work in n days, then A’s 1 day’s work = (1/n) If A’s 1 day’s work = (1/n),then A can finish the work in n days. A is thrice as good a workman as B, then: Ratio of work […]
TIME AND DISTANCE IMPORTANT FACTS AND FORMULAE Distance Distance Speed = Time , Time= Speed , Distance = (Speed * Time) x km / hr = x * 5 18 x m/sec = (x * 18/5) km /hr If the ratio of the speeds of A and B is a:b , then […]
PARTNERSHIP !IMPORTANT FACTS AND FORMULAE I Partnership: When two or more than two persons run a business jointly, they are called partners and the deal is known as partnership. Ratio of Division of Gains: i) When investments of all the partners are for the same time, the gain or loss is distributed a among […]