First, considering the sales tax applied to the whole price:
Leo purchases $700 worth of plantings. If the sales tax is 7%, we'll find the final price by doing:
7% = 0.07
107%= 1.07 (goods price + tax)
1.07*700 = $749
So, the price after the tax is $749. He has a 14% discout, so:
14% = 0.14
100%-14% = 1-0.14 = 0.86
0.86*749 = 644.14
Answer: $644.14