If it is 30% off, then u r paying 70%
70% of 17 = 0.7(17) = 11.90 ...this is without tax
u have a tax rate of 6%.....
11.90 * 1.06 = 12.614 rounds to 12.61 <== total cost including tax
If you mean dimes, the coin with a value of ten cents, that 29 dimes would make 290 cents or $2.90
1 centimeter=10 milimeters
so ur answer should be 40 millimeters per year