**Question**\nParamenters: \n* array of currency conversion rates. E.g. `[\'USD\', \'GBP\', 0.77]` which means 1 USD is equal to 0.77 GBP \n* an array containing a \'from\' currency and a \'to\' currency\n\nGiven the above parameters, find the conversion rate that maps to the \'from\' currency to the \'to\' currency. \nYour return value should be a number.\n\n**Example:**\nYou are given the following parameters: \n* Rates: ` [\'USD\', \'JPY\',  110]` `[\'US\', \'AUD\', 1.45]`  `[\'JPY\', \'GBP\',  0.0070]`\n* To/From currency `[\'GBP\', \'AUD\']`\n\nFind the rate for the \'To/From\' curency. In this case, the correct result is `1.89`.\n\n----------\nRelated problems:\n* https://leetcode.com/problems/evaluate-division/

Question\nParamenters: \n array of currency conversion rates. E.g. [\'USD\', \'GBP\', 0.77] which means 1 USD is equal to 0.77 GBP \n an array containing a \'fr