3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679821480865132823066470938 etc.
Sin is opposite over hypotenuse. The opposite is 12 in this case, and the hypotenuse 13. The answer is 12/13.
Answer:
Where is your attachment ?
$36 x 1.07 = $38.52
The cost will be $38.52
Tax on this is $2.52