[HELP]

1. A student divided a number by 2/3 when he required to multiply by 3/2. Calculate the percentage of error in his result.


2. A dishonest shopkeeper professes to sell pulses at the cost price, but he uses a false weight of 950gm. for a kg.
His gain is …%.

3. A software engineer has the capability of thinking 100 lines of code in five minutes and can type 100 lines of code in 10 minutes. He takes a break for five minutes after every ten minutes. How many lines of codes will he complete typing after an hour?

4. A man was engaged on a job for 30 days on the condition that he would get a wage of Rs. 10 for the day he works, but he have to pay a fine of Rs. 2 for each day of his absence. If he gets Rs. 216 at the end, he was absent for work for ... days

5. A contractor agreeing to finish a work in 150 days, employed 75 men each working 8 hours daily. After 90 days, only 2/7 of the work was completed. Increasing the number of men by** ________ each working now for 10 hours daily, the work can be completed in time.