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function toDeci(fraction) {
    var result, wholeNum = 0, frac, deci = 0;
    if(fraction.search('/') >= 0){
        if(fraction.search('-') >= 0){
            var wholeNum = fraction.split('-');
            frac = wholeNum[1];
            wholeNum = parseInt(wholeNum, 10);
        }else{
            frac = fraction;
        }
        if(fraction.search('/') >=0){
            frac =  frac.split('/');
            deci = parseInt(frac[0], 10) / parseInt(frac[1], 10);
        }
        result = wholeNum + deci;
    }else{
        result = +fraction;
    }
    return result.toFixed(2);
}

console.log('1 ',toDeci("1-7/16"));
console.log('2 ',toDeci("5/8"));
console.log('3 ',toDeci("3-3/16"));
console.log('4 ',toDeci("12"));
console.log('5 ',toDeci("12.20"));
console.log('5 ',toDeci("1"));