Without delay, let's solve this. We've got 77 and we will be multiplying it by 50, that is, adding 77 to itself 50 times.
Step 1: 0 + 77 = 77
Step 2: 77 + 77 = 154
Step 3: 154 + 77 = 231
Step 4: 231 + 77 = 308
Step 5: 308 + 77 = 385
Step 6: 385 + 77 = 462
Step 7: 462 + 77 = 539
Step 8: 539 + 77 = 616
Step 9: 616 + 77 = 693
Step 10: 693 + 77 = 770
Step 11: 770 + 77 = 847
Step 12: 847 + 77 = 924
Step 13: 924 + 77 = 1001
Step 14: 1001 + 77 = 1078
Step 15: 1078 + 77 = 1155
Step 16: 1155 + 77 = 1232
Step 17: 1232 + 77 = 1309
Step 18: 1309 + 77 = 1386
Step 19: 1386 + 77 = 1463
Step 20: 1463 + 77 = 1540
Step 21: 1540 + 77 = 1617
Step 22: 1617 + 77 = 1694
Step 23: 1694 + 77 = 1771
Step 24: 1771 + 77 = 1848
Step 25: 1848 + 77 = 1925
Step 26: 1925 + 77 = 2002
Step 27: 2002 + 77 = 2079
Step 28: 2079 + 77 = 2156
Step 29: 2156 + 77 = 2233
Step 30: 2233 + 77 = 2310
Step 31: 2310 + 77 = 2387
Step 32: 2387 + 77 = 2464
Step 33: 2464 + 77 = 2541
Step 34: 2541 + 77 = 2618
Step 35: 2618 + 77 = 2695
Step 36: 2695 + 77 = 2772
Step 37: 2772 + 77 = 2849
Step 38: 2849 + 77 = 2926
Step 39: 2926 + 77 = 3003
Step 40: 3003 + 77 = 3080
Step 41: 3080 + 77 = 3157
Step 42: 3157 + 77 = 3234
Step 43: 3234 + 77 = 3311
Step 44: 3311 + 77 = 3388
Step 45: 3388 + 77 = 3465
Step 46: 3465 + 77 = 3542
Step 47: 3542 + 77 = 3619
Step 48: 3619 + 77 = 3696
Step 49: 3696 + 77 = 3773
Step 50: 3773 + 77 = 3850

So, 77*50 = 3850