percent
multiplying
adding
100

20% off 20$

4$

100

35 x 72 

2520 

100

3 + 2

5

200

50% off 1000$

500

200

1 x 2

2

300

35% off 785$

274.75

300

27 x 7.8

210.6

400

83% off 231$

39.27

400

47.7 x 2.31 x 3 

330.561

500

29% off 8921$

2587.09

500

69.92 x 23.1 x 2.2

3553.3344