Question

By selling 45 lemons for ₹40, a man loses 20%. How many should he sell for ₹24 to gain 20% on the transaction?

Answer 1

let cost price of 45 lemon was 100%
loss 20% means he sold on 80%.
means 80% = 40Rs then 100% = (40/80)×100=50Rs
so cost price was 50Rs
now, to get 20% profit he should sell at 120%
if 100% = 50 then 120% = (50/100)×120= 60Rs
means if he sells at 60Rs he will get profit of 20%
i.e 60Rs = 45 lemon then 24Rs = (45/60)×24
9×2 = 18 lemon
he should sell 18 lemon in 24Rs.

Answer 2

Step-by-step explanation:

(1) Distance travelled in first 5 sec= area of ABDE= 20×s=80m

(2) Distance travelled after the brakes are applied (area of BCD)=

2

1

×8×5=20m

(3) Total distance travelled= AreaofABCDE+AreaofBCD=80+20=100m

(4) Acceleration during the first 5 sec= 0, because uniform velocity.

(5) Acceleration during the last 8 sec= v=0,u=20m/s,t=8sec

⇒v=u+at⇒0=20+a(8)

⇒a=−2.5m/s

2