no major problems bar paintwork can get bad but like any tractor you look after it and service it . it will last a lifetime.
The answer to the problem 390 times 20 is 7800. The easiest way to work multiplication problems is to use a simple calculator. Another easy way is to know your mulitplication tables.
390 squared is 390 times 390 = 152,100
46% of 390= 46% * 390= 0.46 * 390= 179.4
390
390 is divisible by 3: 390/3 = 130 390 is not divisible by 9: 390/9 = 43.3 recurring (that is, 43.3333..) 390 is divisible by 10: 390/10 = 39
20% more of 390= 390 + (0.2 x 390) = 468
390
70% of 390 = 273 = 70% * 390 = 70%/100% * 390 = 273
110 percent of 390 =429 110% of 390 = 110% * 390 = 110%/100% * 390 = 429/1 or 429
390 x 3 = 1170 390 ÷ 3 = 130
390 = 39,000%
390% of 119 = 390% * 119 = 3.9 * 119 = 464.1