During a certain day, a worker made 81 parts. he usually does 45 parts per day. what was the percent by which he increased the number of parts he usually makes?

Increase by 80%

Step-by-step explanation:

45 : 100%

81 : y

y × 45 = 81 × 100

45y = 8100

45y ÷ 45 = 8100 ÷ 45

y = 180

180% - 100% = 80%

Increase by 80%

62.5 paisa

step-by-step explanation:

4000*70 = 280000

280000-(2000*90) = 100000

4000-2400 = 1600

100000/1600 = 62.5

( give brainliest)